Oh I would love that and I think many would though you would have that absolutely HIDEOUS power brick and who would ever want that? : P
But seriously, for right now... the only game I want to play on my Mac mini is Gauntlet: Dark Legacy the arcade version through MAME.
I somehow feel even the base iMac could handle it but it would actually be cheaper to rent the arcade machine itself for a few days than to buy an iMac.
In addition, it would have been cool to play Diablo...