I use a Netgear WGR614 v7. This was a replacement for an old Linksys 802.11G router I was using. the Linksys router constantly dropped the wireless connection, and the wired connection was only slightly better. The Netgear router I'm using has been running full tilt for nearly a year now without anything so much as a hiccup, even when downloading torrents on one machine while another machine browses the web.
I have one desktop wired into it, one wireless desktop, and three wireless laptops. Two Wiis, five Nintendo DS systems, and two PSPs. Even with most of these systems up and doing something on the internet, the router still runs strong.
I don't know how much of a difference the v7 would make over the v6, but if my network is any indication, quite a bit.
If you're looking to upgrade, I would suggest a wireless G MIMO router. The speed and range is about as good as wireless N, but you won't be as likely to have the interference the wireless N routers have a tendency to receive, as wireless G has a lot more channels to pick from than wireless N.
Dual band wireless N routers are supposed to be better where the interference is concerned, but I haven't tested them yet.