Buying a PSP for one game is little different from buying a 360 for this game though.
Sure you might only have 1 game for the PSP, but you have all the different features it contains.
Buying a $300-$350 360 + $50 XBL subscription + the game (which btw I only give a 7.0 out of 10) is a bit of a stretch.
Now granted, as much as I like Bomberman, I'd only buy a 360 in the $200 or less range lol just for that game alone.