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I'll vote for Half-Life 2 as well. It's available on pretty much any PC now, plus PS3, XBox 360, and XBox Classic (which is the version I'll be playing if it works on 360.) If you're buying HL2 now, you might want to wait until Sunday, when the deals roll over, it might go as a Community Choice/Flash Sale for $2.50 between now and then (if $2.50 is worth waiting for to you.)