I just ordered a GTX260. At newegg you can get one for $254 and there is a $40 mail in rebate. From what I've heard, eVGA rebates are extremely fast, so you won't have to wait too long to get that back.
PLUS, you get free Far Cry 2 and 3DMark Vantage.
I plan on selling my 8800GTX on ebay to make most of the money back, so I'll basically be spending $15 for a video card and getting a free $50 game that I want.
On top of that, with a well ventilated case a 260 should overclock to be about as fast as a stock 280.
Its not the HUGE upgrade I wanted but its a hell of a deal.