The 8800GT's have always been in that $250 price range since day one.
Any specific reason why you still have vista on there? Is it because you like the way it looks all fancy and sleek?
If so, you can get everything the Aero interface has with this.
Transparency, vista theme and look, their object desktop package (which I use) has an icon managment program that you can download icon packs (like a vista icon pack), they have desktop widgits just like vista, etc...
the only thing it doesn't have is the desktop flip where you hit some button and it tosses all the windows out cascading. It's a neat parlor trick but object desktop has the windows tab view and thumbnail viewing also. This is the skin I use.