I haven't posted in 5 months but wanted to mention that I did research cooling the nVidia 8800GT that I bought from XFX. To cut to the chase, I purchased the Thermaltake DuOrb which sports a lot of copper and two fans. It only cost $50 and was well worth it. It keeps the 8800 cool and runs silently.
Thermaltake no longer sells this model as they are always improving their product line, but I highly recommend them for cooling your video board.