<< My XP 1600+ oc'ed to 1533 Mhz get 42db under load (running Seti and 3dMark 2001 at the same time). >>
Why does it matter what the sound pressure is?
Anyway, I'd say either the Swiftech MCX-462 or the Alpha PAL 8045. Swiftech beats it out in most tests, but the Alpha is less expensive.