Let me take this opportunity to brag about my video card. Just kidding.

If anyone wants to see an equivalent passive video card, I bought an X1650 XT iSilence II from case-mod.com
The driver that comes with it sucks but the latest 7.5 works well.

It's a two slot video card but that's OK for me because I don't use crossfire (I have one card on a crossfire motherboard).
To answer you more specifically, there is the Arctic Cooling Accelero 2. Look at the various coolers here. The compatible model numbers are listed below the pictures of the coolers.
http://www.arctic-cooling.com/vga1.php
EDIT: I don't know if this is worth mentioning. But, looking at the Arctic Cooling passive solution, I see there is a difference between my iSilence II model and adding an Accelero 2 to a card. On my iSilence II, you have a grill that allows for ventilation from the back of your case. I think that would make a significant difference in temperatures.