I'd recommend a Billion 7800N. It supports 802.11n, it has 4 Gigabit ports and it supports IPv6. It's a very solid router, with good firmware.
I had a bad experience with a Netgear DGND3700, which had very buggy firmware.
Not all new routers support IPv6. Incredible, but true.
Edited by dewi (Thu 02-Feb-12 15:11:53)