I'm plenty optimist & positive regarding AMD graphic, but your expectation is the one that can be called dreaming mate, no offense.
Especially if Cayman is THAT good, i won't expect it to be priced lower than HD 5870 launch MSRP, beetween US$ 429-469 most likely. I believe it won't be priced north of US$ 499 limit (that will create a very bad buzz among consumers, reduces the goodwill built up to this point, and put a squeeze on Antilles pricing strategy), put my posting right on the line, but AMD can use more profit if the card warranted its price.
As good as Cayman would be, i can't believe it would be clearly twice faster on average than Bart in real gaming. Bart's street prices are gonna decrease by the time Cayman got launched, it has to be factored as input in Cayman pricing decision IMHO.
Antilles ? Now we're talking, this is the big gun, undisputed king of the hill (unlike HD 5970 which was disputed by nVidia fanbois using minimum frame rate, microstuttering, etc argument). AMD has more leeway in its pricing strategy, as flagship product that caters to limited segment, the price sensitivity of its potential buyers would be low, and it won't generate a bad buzz even if the performance doesn't really warrant the price tag slapped on it. I expect MSRP beetween US$ 729-799, perhaps even more if the supply is rather limited because of Cayman high sales rate & the demand is relatively aplenty. Company still loves profit, you know.
EDIT:
I might very well be wrong, and i hope i'm wrong, that the pricing would be lower than the number written above. I love to be wrong that way, hehehe.

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