Get an xbox, its alot cheaper then a pc, and for the upgrade you would most likely need to play them games looking better then xbox versions, its also going to cost you alot less, now the xbox cpu being 533MHz or whatever doesn't matter, look at some of the games that play on the xbox with that processer, would they plau looking that good on a pc with the same specs??, no they wouldn't, a consoles processer power, and a pc's processers power can not be directly compered, as with a console the games can be very optimized as they are only working with hardware that will be in every console, with a pc they have to take into count lots of hardware, so yeah its really down to you, but if i was you i'd get an xbox, its going to cost you alot less.