I've bought a xbox 360 yesterday, I have cod4,cod5,gow2,nhl 09,gta4,fable2,halo3. I am buying 1 more game, should I get either L4D or NFS undercover? How is L4D on the XBOX? I have l4d on the PC and beat all the campaigns but theres really new content after that. Or what other game should I get?