Wait? Since when does the 250 GB cost $450? I thought they were $350. The only way your math seems to work out is if you're getting some sick bundle like the all the BF adds where you're essentially getting $100 worth of games free with a 120 GB at $300.

Fifty bucks isn't bad if for no other reason than to save you the hassle, but I'd probably still go with the 120 and self-upgrade myself if it became necessary (my present course of action as a matter of fact). The 120 is only sweetened by the bundle if that is indeed the case.