I would go with a switch instead of a hub. Large amounts of file transfers will really slow down the network. Make sure that you can run the games in a dedicated server mode.
Beer and booze is great but felex forgot that no LAN is complete unless you have a DVD player, VCR and TV. You have to have all sorts of movies: action, comedy, "bonding" (dont ask if you dont know).

You have to have something to look at while the map is changing, your eyes have gone buggy after several hours of fragging, or during the eating period.