As the different brands are famous for router specially TP-Link routers are reliable and mostly have more ranges. You can check latest list of wireless routers from here http://listsplash.com/best-...uter-2017/
But if you are looking for under $100 than this list has also good package for you.
Well, sometimes you wanna go with custom solution like ubiquiti router and Wireless access points or sometimes you can pick one up according to your needs, whatever fits your bill is best for you.
Well, here is a good round up and comparison between top notch routers right now.
It all depends on how much you want to spend. The cheaper you go, the less functionality you'll get. The more you spend the better functionality you'll get. It also depends if you want a router that support DD-WRT flashing.