Voted for the Cube even though I'm building a complete Xbox collection. I may have chosen the Xbox if the thing worked. Mine had a faulty drive out of the box, and the replacement started to die soon after. For some reason, when I first called MS customer support, they immediately said they had been recieving "a lot" of reports like mine, but when I called about the replacement drive, they said that they had never heard of anything happening. Anyway, I can't enjoy what I can't use.
The Cube, on the other hand, never breaks down and is graphically as impressive as the Xbox. And the good games are very, very good.