So I recently just got a WRT1900AC. It's the most powerful router you can get. It looks sick and it is awesome.
Speed Test with it over 802.11n (not even AC yet!)
Unfortunately where I am there isn't enough free space on the 5GHZ network to use AC (you need 80Mhz or 160Mhz channels, and there is only 40Mhz channels right now). However, going to where I have no internet but can use AC channels you get 1030Mbit/s speeds which is absolutely insane. This is with my mbp retina so 3 antennas, same as the router (it dynamically switches off the 4th because the chip can't yet handle pushing 4? something like that).
Pic 1:
http://m33-x7.evilzone.org/bluechill's_charity/IMG_1097.pngPic 2:
http://m33-x7.evilzone.org/bluechill's_charity/IMG_1099.pngIt also has an eSATA port, USB3, and 4 ethernet ports. And it supports OpenWRT (or soon will because they just need to open source the wifi driver for it which will be soon). It is awesome because it is one of the few routers with an eSATA port and the only 802.11AC router to support OpenWRT.
Yeah, just thought I'd make you guys jealous.