It's still a ways away, but Call of Duty 4.(Find the beta)Rainbow 6 Vegas is good too.

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Probably Halo Wars.

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Oblivion. Definitely Oblivion. This game is one of the best RPG's of the last ten years. Bioshock is good, but you'll get more for your money with Oblivion.

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XBL Gamertag: egraves7