If you're going wireless;

-Make sure you know the gHz of the router, sometimes wireless land phones can interrupt the signal.
-The new n routers are ridiculously fast, and have a stronger signal on the fringes of the signal.
-Before you buy it make sure you can place it in a central location to the house (or a central location to your gaming/internet usage) so that you get the best signal everywhere.
-If you want good performance be ready to drop some $$$.

I'll look up the one my dad bought at his beach house. It split me and him running games, while my mother and brother were on the internet pretty well.