How can I say 680 or 670 if I haven't seen the price/performance yet? I will say I own a 5870 and am waiting to see what Kepler brings in the $300 market. Current 7xxx performance is great, but the price is more than I can stomach at the moment.
"not sure" and "already own an hd79xx" are the two only logical answers. Any other answer is based off of assumptions and no concrete evidence of anything yet.
"Own a 40nm or older Card and skipping Kepler" isn't a logical answer?
There's a second part to the question that I should have made a poll for. What would it take for the 680, 670 and 660 to be appealing for you given what you own now.