Check out
QuietPC.
Expensive, but if you're serious about noise reduction/elimination they're the only way to go.
Other quiet PC ramblings:
For a HS/Fan: Taisol CGK760 + one of
these. Gotta love 16.1 decibels.
Case fans: Go to
HeatsinkFactory.com, look under 80 mm fans for the Panaflo low output. 24 cfm, 21 dba.
I've modified two power supplies thus far with low output 80 mm fans, & they work great.
The system I'm working on right now for my g/f is using one of the Panaflo's in the P/S, & the Adda on a Taisol HS. The loudest noise in the system (by far) is the IBM 60 GXP, which will soon be encased in a
SilentDrive.
Viper GTS