if you could have 1 game

i am only able to buy 1 game this month, now my top 3 are far cry 2, LBP, and Resistance 2, i like all 3 and im sure ill have loads of play time im just not sure which one to get, i want peoples opinions on the matter of which one to choose, or if they have any other suggestions of games that im not aware of that might be a possible choice (already have mgs4 and gta4)

edit: i also dont like racing games and i can download far cry 2 for pc its just i want to play online since fps shooters are always fun in multi