I guess I'm the only one who isn't surprised that the 128GB sold out. Do you guys remember that when they made the Xbox 360 originally it launched in the Core and Premium (I had initially written Arcade and Pro here, but my intention was Core and Pro)versions with none and 20gigs HDD respectively? If my memory serves me right, they had higher sales of the 20 gig model rather than the arcade model.
Holding that thought train did anyone else compare this to the Dan Ariely's 'Predictably Irrational' chapter of human choice. Given A, A-, and B, A looks better than B precisely because our minds compare A with A-, over which it's clearly superior and applies that to B as well. Only, here they don't need a B. They've made it work fantastically with just A and A- options.