if Barts XT is about as fast as Cypress XT (5870), but much smaller (lets say 260mm2) and uses less power... why not? ATi has done that in the past... remember 2900 > 3870?

If priced at GF104 level or slightly above, that would be a real killer!

But there's also Cayman (which could be 50 to 60% faster as Barts XT).

lets see...

Barts PRO - 199,- (460 1GB level)
Barts XT - 279,- (470 level)
Cayman PRO - 349,- (480 level)
Cayman XT - 499,- (+30% above 480)
Antilles - 699,-