I would lower the Wii estimate to 3.5 million because I believe it will still be supply-constrained out over the holidays. Not for the lack of great titles though; software sales will still act like it sold 4.5 million units.
I would lower the Xbox 360 to last year's sales on the basis of no real price cut and the fact everyone who wants Halo 3 would tend to already have a 360 for their other probable favourites Crackdown and Gears of War.
I would raise the PS3's sales to 1 million simply on brand-name strength with parents because like you said $600 does not present much of a barrier at Christmas and it "doubles as a Blu-ray Player" which encourages money-rich, time-poor parents to buy it for their children regardless of utility or Blu-ray's true value.
Ubuntu. Linux for human beings.
If you are interested in trying Ubuntu or Linux in general, PM me and I will answer your questions and help you install it if you wish.
