X-mas gift for Half-Life player?

So Half-Life 2 isn't coming out for a while but I want to get my brother something that will enhance his gaming experience once he gets the game. He loves first-person shooters like Halo and Day of Defeat, but I don't want to get him a game - maybe like a computer accessory or video card or something. Can you help me with suggestions?

what video card does he have now?