Alienware makes computers that cost twice as much as macs, and have hardware of comparable superiority. You're paying for the fancy case. The markup on macs are not outrageous when compared to any other computer company. Also, when you consider that macs come with a ton of software that most machines that come with windows pre-installed do not have, you're going to save money. I can't respectably make that argument though, since I don't usually pay for software.
But in any case, hdx, if you could get your hands on one, I'd definitely be interested. I'm currently saving up for a something of that nature anyways.