Kurse, I'd also recommend waiting to see how the 3870 performs. I've heard Nov. 15 as the release, but the 19th is still close enough to wait for it. Suggested retail pricing seems to be $190-$240, and with what info has been leaked out already I think it's definately worth a look vs the 8800GT.
Another thing to consider is availability. Obviously, the 8800GT's are out of stock everywhere atm. Daily Tech had an article up just the other day about how nVidia is likely going to miss out on lots of Christmas sales this year because they launched the 8800GT with only 40,000 units while the AMD/ATI cards are reportedly already at 250,000 units, with another 150,000 to come by the holidays. Basically, supply>demand may keep the price of the 8800GTs up and difficult to obtain.