D-Link DGL-4300 GamerLounge Wireless 108G Gaming Router. You can even prioritize your ports so when you're playing a game, that will be the maximum bandwith it needs etc. It'll set you back about $125 plus change depending on site. But it's gotten great reviews and has several gaming magazine Editor's Award/Pick.
i have a linksys WRT54G and its great! i previously had a d-link but it stopped worked...smelled wierd. the linksys is the best! you can play any game without worrying.