Well its pretty simple. How fast will the price drop of each console in the US? Every gues allowed. (Bundles, maybe new Versions etc.).

My Predictions:

X-Box 360 "Premium": At the moment $399

Late August - Begin of Oktober: New version with 65 nm Processor, price drops $50 - $70.

Playstation 3 80 GB Model: At the moment $599 

 If microsoft gets the 65 nm, so does Sony (Just google). So "new version" is likley.  And i think it will be about $469. The 60 GB is gone by then. Most properbly this will happen at late Oktober or November. There could be also a bundle with a game for $499.

 In June or July 2008 there will be another drop to $399 .

Nintendo WII:

I think also June or July 2008 they will drop the price to $179-$199.

Pssst, sony already dropped the PS3 to $499 in the US.

 Psst: Read again ;)

Pssst, the 80gb isn't out yet. :P

(it's still early here and right now the 80 looked like a 60 to me, sorry)

As far as I know, Sony has already switched over to the 65nm process. Also, I highly doubt Sony is capable of lowering their prices twice in four months.