Linksys WRT54G.
It's all we use here at work, it's what I use at home, it's what I install when people ask me for help with a home network.
Set, forget.
What he said.
I've been using a WRT54G for about 6 years now, and an 802.11b Linksys before that (which is still going strong at my old employer's office as their QUAL environment router(Damn, they owe me a router!)).
Most devices will do the trick, although N is not yet worth the premium you will pay for it.