Good yet quiet heatsink/fan combo for Athlon

[The PIT]

Okay I've now got two noisy computers. The reason why it's gone up to two is that I've swapped motherboards on one machine and heatsink fan combo is noisy. I can put up with one but two is pushing it a bit.
Now what do you knowledgable people recommend.

[Tempest]

Try changing those small fans to larger fans. Large good quality fans generate the same amount of airflow with a slower speed of rotation. Or try watercooling If larger fans can not be mounted onto your heatsink there are also adapters that will let you to do this, such as the one in this picture:

http://www.jimmspc-store.fi/kuvat/new/Tuuletinadapterialuv2.jpg

[Greebe]

Zalman CNPS3100 (G) would be the best quiet air cooled setup if going for new... but also switching out the fans for larger ones would greatly reduce the noise levels(with fitted duct)... or water cooling like what I did... tho even if you DIY it'll cost at least double what a air cooled HS setup will (mine was roughly $100)