I'm looking for a new FPS for my Xbox 360 and i'm Purely interested in multi player. I already have all the Call of Duty's i want, borderlands, Red Dead Redemption (not an fps i know), Left 4 Dead 2 (not interested in 1), The Orange Box, and Halo 3, So i am looking for a GOOD Fps With GOOD online play, not all that interested in third person shooters, I'm thinking of getting Bioshock 2 right now, and i'm not all that interested in Battlefield bad company 2. So please any Suggestions.

After reading the first couple of responses i feel i should add, thank you for the suggestions but i am PURELY interested in Fps's with Long Term online play.