I like my Airport Extreme, Express and Time Capsule. Yeah, you do pay the Apple tax but they work.

I REALLY like the newer Airport Extreme and Time Capsule because they are simultaneous dual band. That means you can run 2.4GHz AND 5 GHz at the same time. You can split your network for data and video or however, you like.

Linksys has a similar one. You can also just get an Airport Express and connect it to your existing network. Just set it up for 11n in bridge mode and leave the rest of your network up and running.