Have you seen <A HREF="http://www6.tomshardware.com/cpu/20041213/index.html" target="_new">http://www6.tomshardware.com/cpu/20041213/index.html</A> Just make sure you get the fanmate2. I would get the alcu model.
Zalman offers an adapter allowing you to use the CNPS7000 on socket 775. The CNPS7700 is natively socket 775 and it’s a more efficient cooler because it’s larger, which is of course also it’s disadvantage. I’d recommend the CNPS7700-Alcu, aluminium DOES NOT conduct heat better than copper, but it’s lighter and not as expensive, still a CNPS7700-Alcu cools more than a CNPS7000-Cu which both costs and weighs about the same, you should be able to use that one with low fan-speed with your processor. If you want serious cooling go for the CNPS7700-Cu, it weighs over 900 grams, or about 2 ibs, however.