Id suggest a Linksys WRT-54G wireless router. Great piece of work, most of it is done by Cisco, and it's got pretty much all the tweaks and goodies you could want.
If you start dropping packets because of interference, it depends on how bad it is as to what effect it will have on the game. If it just drops a few, you won't even notice, as most games are written to take that into account. If it's bad, however, it could randomly disconnect you from your game or give you what feels like lag spikes--everything sorta stops all of a sudden from the lack of packets, then starts going again.
Again though, like Willravel, I've done plenty of gaming over wireless and never had a problem. YMMV, though.
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