An Asus 750N something. Forget the exact model. It is a couple years old. I'm trying to convince the household to get an 802.11AC router, though I don't know if we would actually see a difference. Getting about 45-60mbps on the 5GHZ. Way more variable on the 2.4 setting.
I had a previous gen AirPort Extreme (802.11a/b/g/n) and just got the latest AirPort Extreme with 802.11ac...my speed test results went from 30-50mbps to 120mbps on the 5GHz band. Regular internet browsing isn't night and day difference but it really shines when it comes to downloading files & streaming video.
Obviously, won't do much good if you're having severe connection dropout issues though. Hopefully Apple releases another update soon that fixes the WiFi problems.