Just about any router will suffice. I have a Linksys WRT54G and I've been thoroughly happy with it. I like it better than any other household router I've dealt with to date when it comes to managing the router's settings, and Linksys' frequent firmware updates have added lots of new or enhanced capabilities since I originally purchased the router nearly 2 years ago.
I also hear good things about Netgear routers, I have always just preferred the layout of Linksys's webadmin utility over Netgear's. Don't get D-Link though, in my experience they tend to be crap.