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You'd expect some 2nd hand ones to appear after the 480 release, as long as nVidia can produce enough 480s to cause some movement in the market.
And if you're going to void the warranty by watercooling then you may as well go 2nd hand.
Second hand blocks might be the way forward for you as well, they tend to be hard to shift on their own, as i found out. Ive still got a gtx 280 (original design) which i don't need or want that just been collecting dust for over a year now, despite trying to sell it for less than a third of what i paid for it.
But yea, get your post count up, and just place a wanted ad in the MM, then watch all of the users like myself flock to your thread on the 26th of march. Unless fermi sucks, in which case meh.
You'd expect some 2nd hand ones to appear after the 480 release, as long as nVidia can produce enough 480s to cause some movement in the market.