A great tool for the price is the ryobi PCL515B with quick blade change and enough power to get the job done from cutting wood to tree branches this tool packs a punch, I am completely satisfied with this product, it has a nice weight balanced ratio, it even cut clean through rebar in a flash. This is one of my Ryobi favorites 

Expand your RYOBI 18V ONE+ System with the RYOBI 18V Reciprocating Saw. Equipped with a 1 in. stroke length and 3,400 SPM this saw is ideal for fast cuts through mutliple materials. The easy blade release lever ensures simple blade changes to quickly switch between cutting applications to complete over 145 cuts per charge. The variable speed trigger and pivoting shoe maximize control throughout the duration of the cut. Best of all, it is part of the RYOBI ONE+ System of over 300 Cordless Products that all work on the same battery platform. This 18V Reciprocating Saw is backed by the RYOBI 3-Year Manufacturer’s Warranty.

If you're looking for a higher end tool you can't go wrong with the milwaukee 2621-20 which also has quick blade change and is a nice addition to any milwaukee set, I haven't been able to try this tool yet 

The M18 SAWZALL Reciprocating Saw delivers exceptional durability, speed and run time. The all-metal gearing and REDLINK Intelligence provide ultimate performance and protection against job site conditions. The M18 SAWZALL Reciprocating Saw provides up to 30% faster cutting and 50% more run time in key applications versus leading competitors. The slim front-end design provides improved ergonomics, offering maximum comfort and control.

Counterbalance mechanism reduces vibration for more control and less fatigue

All-metal gearing and gear case provide maximum durability

Lever action Quik-Lok blade clamp allows fast and easy blade changes

Redlink intelligence advanced overload protects the tool against abusive conditions and provides maximum life

Stroke length: 1-1/8 in.

Protected by a 5-year limited Milwaukee warranty

Compatible with all M18 batteries

Compatible with all M18 chargers

The RYOBI 18V ONE+ HP Brushless line of products is redefining power and performance. The RYOBI 18V ONE+ HP Brushless Multi-Tool (PBLMT50B) and its aggressive 3.6° oscillation angle provides up to 30% faster cutting speeds allowing you to work more efficiently and effectively. The adjustable speed dial which operates at up to 20,000 Oscillations per Minute (OPM) gives the ability to make cuts into drywall, metal, wood, plastic, composite, and many other materials, along with the ability to sand the finest details. The tool-free accessory release makes switching accessories quick and easy which means less downtime. A built-in LED light illuminates dark work areas for improved visibility. The slide-on power switch eliminates the need to continuously hold a trigger while working which provides less user fatigue over extended use. The 18V ONE+ HP Brushless Multi-Tool is compatible with most multi-tool accessories from other brands. Best of all, it is part of the RYOBI 18V ONE+ System of over 225 tools that all work on the same battery platform. This Brushless Multi-Tool is backed by the RYOBI 3-Year Manufacturer's Warranty and includes the PBLMT50 18V ONE+ HP Brushless Multi-Tool, a wood cutting blade, a segment saw blade, a sanding pad, 3 pieces of sample sandpaper, 

I just got one of these yesterday, so stay tuned and I'll let you know how it goes! 

For diy projects and a cheaper option is the ryobi RRT200, I use this on smaller projects and couldn't believe how well it worked for me, from engraving and sanding to cutting and polishing numerous materials, and with all the attachments on the market this is a very versatile tool and for 60 bucks you can't go wrong, and you can buy additional batteries so run time is amolst infinite 

It's a really good tool and it stacks up well against the dremel below but for less money you really could go for either option, if your not brand loyal the Bauer is probably the way to go, I have this one and also the Bauer from harbor freight and I have to say the are both equally as good, sure the buttons and switches are in different places but oth er then I'd probably pick the Bauer, and get it while they are running one of there specials, the only bad thing is that with the Bauer if your battery runs out you have to stop working and and charge it up which take about a good hour and the ryobi if you have more then one battery just go go go.

RYOBI USB Lithium Rotary Tool. The rotary tool features a compact design that delivers more power for any application. The new innovative Quick-Change Collet with 4X faster accessory changes, which makes switching accessories quick and easy. This kit comes with 15 accessories for a variety of applications such as carving, sanding, polishing and more. This product features an LED indicator to signal when the battery is charged (green) or has low battery (red) while in-use. The USB Lithium Rotary Tool is a part of the USB Lithium System that provides compact, portable, rechargeable solutions for cordless power and productivity. This USB Lithium Rotary Tool is backed by the RYOBI 2-Year Manufacturer's Warranty and includes (1) Rotary Tool, (1) USB Lithium Battery, (15) Accessories, (1) Wrench, (1) Accessory Storage Case, (1) USB Cable and Operator's Manuals.

Compact design delivers more power for any application

Quick-Change Collet with 4 times faster accessory changes

15 Rotary accessories for a variety of projects

LED indicator signals low battery

Powered by the RYOBI USB Lithium Battery system for portability and minimal down time 

Includes: FVM51 Rotary Tool, FVB01 USB Lithium Battery, 15 Accessories, Wrench, Accessory Storage Case, USB Cable and Operator’s Manuals

Do it all with just one tool, and make that tool the Dremel 4000-6/50 Rotary Tool Kit. The key to a perfect result is having maximum control over your project. The Dremel 4000 with interchangeable accessories and attachments will give you just that. The tool has a 360-degree soft grip for greater maneuverability and comfort in any position. Tackle even the smallest and most detailed tasks in awkward and tight spaces. With 5,000-35,000 variable speed control and separate on/off switch, you will always be able to pick up your project right where you left off. Together with the high-performance motor, the electronic feedback consistently gives you maximum force. This rotary tool kit comes with 6 attachments (flex shaft attachment, circle cutter/straight edge guide, sanding/grinding guide, multipurpose cutting guide, shield attachment, and lawnmower/garden tool sharpening attachment) and 50 accessories for tasks including carving, engraving, cutting, grinding, sharpening, cleaning, polishing, sanding, and more. Tackle any project using any material with ease and precision. Dremel 4000-6/50 Rotary Tool Kit with Attachments, Accessories, & Carrying Case makes it easy to get the job done.

Rotary tool kit with attachments and accessories in carrying case

360-degree soft grip for greater maneuverability and comfort

High-performance motor for maximum performance at all speeds

Electronic feedback for consistent speed under load

Variable speed for greater versatility; 5,000 to 35,000 RPM

Includes: Rotary tool, 6 attachments, 50 genuine Dremel accessories, deluxe carrying case, accessory case, manuals

Can be used with all Dremel rotary tool attachments and accessories

Voltage: 120 Volts; Amperage: 1.6 amps

Dimensions (L x W x H): 3.98 x 15.59 x 10.43 inches

Weight: 5.75 pounds 

And unlike the ryobi this comes with a nice molded case, I remember when most all the tools use to come with actual cases instead of a tool bag, which they did so now you have to buy the modular ones and fit them out with foam and some times that tricky. 

For the higher-end market

This 20-Volt MAX XR 3-Speed Cordless Oscillating Multi-Tool Kit provides up to 57% more runtime than similar brushed tools because of its powerful brushless motor. The Quick-Change accessory system allows you to change blades quickly and easily, and with the universal accessory adaptor, it's compatible with most oscillating tool accessories. The DUAL-GRIP variable-speed trigger and 3-speed selector provide ultimate speed and application control, and the bright LED illuminates dark workspaces. This kit includes a universal accessory adapter, 2 blades, battery, charger, and kit bag.

• 3-speed selector allows users to choose their speed setting based on the application
• Brushless motor delivers up to 57% more runtime over brushed
• Dual-grip variable-speed trigger gives users ultimate speed and application control
• Universal accessory adapter for use with most oscillating tool accessory brands
• Quick-change accessory system allows blades and attachments to be changed quickly without wrenches
• Bright LED illuminates dark work surfaces for accurate cutting

RIDGID introduces the R86241B 18V Cordless Oscillating Multi-Tool Kit. The powerful motor in this 18V cordless oscillating multi-tool gives users the ability to make fast, precise cuts through drywall, wood, metal, and handle a variety of other jobsite materials. The RIDGID 18V Cordless Oscillating Multi-Tool delivers up to 20,000 oscillations per minute (OPM) and is controlled by an easily accessible variable speed dial giving users ultimate control to match speed to any application. Built with maximum productivity in mind, this 18V oscillating multi-tool features a tool-free accessory change design and is compatible with the most multi-tool accessories. As always, this RIDGID 18V Oscillating Multi-Tool is 100% compatible with all RIDGID 18V batteries. Best of all, this tool is backed by the Industry's Only Lifetime Service Agreement, simply register within 90 days of purchase for FREE Parts, Free Service, For LIFE. This R86241 Kit includes (2) 2.0 Ah Batteries, Charger, Cordless Oscillating Multi-Tool, Sanding Pad, Sandpaper, Segment Saw Blade, Flush Cut Blade, and Operator's Manual.

Powerful motor provides up to 20,000 oscillations per minute (OPM)

Enhanced ergonomic design delivers superior comfort and control

3.2° oscillation angle for fast cutting through a variety of material

Tool-free accessory changes for increased productivity

Accepts most multi-tool accessories without the need for an adapter

Conveniently located on/off switch

Variable speed dial provides ultimate control in a variety of applications

100% Compatible: Works with all RIDGID 18V Batteries, Tools, and Chargers

Lifetime Service Agreement with registration within 90 days of purchase

Includes: (1) R86241B 18V Cordless Oscillating Multi-Tool, (2) 2.0 Ah Batteries, Charger, Sanding Pad, Sandpaper, Segment Saw Blade, Flush Cut Blade, and Operator's Manual

For a starter option and maybe you want to buy in to the rigid family, you cannot go wrong at only $99.99