Any recommendations for a wireless access point to be fed by my Airport Extreme?

I have a 105 mbps internet connection going into my current generation Airport Extreme which sits on the first floor of my house. I currently have no ethernet or coaxial connection to the basement and for the time being want to feed a few devices residing down there wirelessly. These include a Windows 8.1 (soon to be 10) HTPC, a blu-ray player, Apple TV, and a home theater receiver with airplay, all being fed through a gigabit switch.

I'm most concerned about file transfer speed within my...

Any recommendations for a wireless access point to be fed by my Airport Extreme?