Mass Effect-branded Xbox 360 Elite. The bad news? The previous sentence applies to exactly one of you. ... And it's you. ... No, not you. You. With the hair.
In order to take your shot, you're going to beat cheeks over to our brothers-in-thumbs at Xbox 360 Fanboy for all the details. Oh, and you can enter every day, so you may want to clear your calendar, just to make sure you don't miss your chance.