Graphics? Who cares about graphics, when the platform has very few good games to itself? Might as well just call the whole platform 'Halo.'
Anyway, that's a conversation best left to another part of the forums. There's no practical way you're going to stuff your Hal-erhh....XBox into a case that costs less than $130.
That'd need more of a custom box that would most likely kill your wallet.
While you contemplate your choices, I think i'll play some Halo PC... ¬¬