I'm expecting £200. Seriusly anymore and people won't buy it. Micro$oft has learnt from their mistakes hopefully and if they want a headstart, that's the way to do it. It's the only way they can get a real foot up from $ony apart from the early release date.
EDIT: Juast as a sidenote, aren't all US prices without tax, so the US are paying more than you expect.