I need some suggestions for xbox360 games?

Ok, I asked a little earlier about a game to get my boyfriend. I got some suggestions, but he has most of the games. He likes mostly first and third person shooters. I think I should mention that he has Fallout 3, Far Cry 2, CoD 2 3 and WaW, Rainbow 6 Vegas and Rainbow 6 Vegas 2, Gears of War and GoW 2, Grand Theft Auto 4, and Left 4 Dead. Him having these all makes my job more difficult. Please help!