Oh the list is endless!
You have the Zalmans, neat full copper works of art. There are also the Swifttechs, using coils instead of fins.
If you want the ultimate in quiet, you could go with water cooling, lots of good kits out there.
vantec aeroflow are nice . about 30$ and very quiet . the glacialtech igloo hsf 's are nice the igloo 2500 is pretty quiet . but if you want really quiet go with the igloo silent breeze 462 ... it is rated at 19BDA ....... you will never hear it .