Asus. I've had a rock solid WL-500Gp and 2 WL-520gU's. They're running DD-WRT, but the stock firmware would probably be ok since the hardware's been excellent. I'm considering the RT-N66U next which is a little pricey but ranks well on SmallNetBuilder throughput charts and supports a custom firmware build that uses the native optimized drivers (or DD-WRT/OpenWRT, etc.).
Also, any Linksys router with an external antenna has been OK, but those are rare now. Netgear and D-Link have been hit or miss for me.
//edit: A couple folks have said Apple Airport. +1 from me as well; I've used one without any incident for a couple years connecting primarily Windows/Android machines.