[ilya]

You basically have the best 360 games already. Since you like shooters I'd highly recommend Call of Duty 2, a super fun game that still looks good and implements cover & epic-battle-feel better than Gears of War. Don't know whether there's still much of a multiplayer community around but the single-player campaign is definitely worth the ~$18 you'll pay at this point.

Condemned is an atmospheric first-person action/adventure but I would recommend a rental unless you can find it for $10 or so. Basically no multiplayer and a ~6 hour single player story with very little replay value. What there is is sweet, though. No connection with that recent movie.