Whiteside Router Bits, possibly one of the best brands of router bits on the market, 

I have many different Whiteside Bits and they never have let me down once and some of them are over 25 years old and still in very good condition, especially after extensive use in the cabinet and kiosk part of my career and before even before that as a finish carpenter, these are truly worth the money, as they say you get what you pay for and I apply that to these, take care of them and they'll last a lot longer than you would expect, I highly recommend these if you are interested in woodworking as a professional, these will give your work that professional look and feel. 

They also have the best customer service if you have any questions or comments, they will do all they can to make sure you are satisfied.

The Spetool compression flush trim Router bit 

SPECIFICATION. Compression flush trim Router Bits 1-1/8" cutting length; 1/4" cutting diameter; 1/4" shank; 3" overall length, can be used on routers with 1/4" collect

COATING. The new coating provide up to 2.5 times life than the uncoated.

SHARP EFFICIENT. The flush-trim spiral router bits is sharper and stay sharp longer than conventional flush-trim router bits.provide better chip evacuation, less heat buildup, and cleaner edges

SMOOTH STABLE. The router bearing bit uses a double ball bearing pilot at the tip to run against your project template ensure smooth running

WIDE APPLICATION. This flush trim bit can be used for any flush trim situation and is an excellent choice for pattern or template work

COMPATIBILITY. The spiral flush trim Router Bits is perfect for soft woods, hard woods, Plywood, laminate, OAK, MDF and any hardwood working. It can be used with table mount and handheld router with 1/4" collet

I was blown away by the performance of these bits, they are extremely well made and they are reasonably priced, this is one of the exceptions to the you get what you pay for saying, they are priced very reasonably at around 20 bucks and they are worth every penny, 

I've ran this bit through dozens of 1/4in plywood pieces and the bit is still as good as new, I even ran it through some walnut and the bit cut like a hot knife through butter, I'm truly blown away by the quality, these are my go to bits for now. I highly recommend it. 

Diablo router bits, I've received a few of these bits, they are decent bits for the amount they cost but there are better bits, as the saying goes you get what you pay for, I recently tried out the bit pictured and wasn't extremely impressed, brand new out of the package there was a lot of chatter, the bit was dull, if you're on a budget and need a bit these will do but I wouldn't recommend these for professional work, if you're just in woodworking as a hobby and only use them sporadically then they'll do but that's about it, I actually used this exact bit a few months back and again right out of the package, the first cut burnt up the bit. All in all they'll work in a pinch but don't count on them for precision work. 

Milescraft 1219 Circle Guide Kit- Router Circle Cutter Jig For Cutting/Routing Small And Large Circles From 1.5in. Up To 52in. Diameter-Includes Bonus Offset Base For Edging Projects, perfect for cutting a perfect circle out of many different materials, and with up to 52in diameter even a table top. No fuss with free hand or the table saw spin trick, (which is very dangerous if not done properly, so if you're making circle cuts again and again this is the set up for you, you can pick one up from many fine woodworking shops, (Woodcraft, Rockler) any online from Milescrafts website. Easy to use and very little set up required and your around the circle in no time. 

The Milescraft Sign Pro is a great kit for all your Sign making needs, it comes with plenty of letters and number, and you can also buy symbols that work with the kit for a very reasonable price, it comes with 4 18inch guide rails to make a template 36in long, and they also sell additional attachments to make it as long as you could possibly need, I've used this many times and made hundreds of signs and it's well worth the money, it has an infinite amount of applications and even more if you purchase the different sets of templates (arrows, punctuations, etc) lay them out whatever way you want and you can even make smiley faces :) this is a must have for serious Sign makers