Quiet PC

I'm extremely picky about PC fan noise , as many of you know. In an effort to quiet my PC (Athlon XP 1800+) I'm making a few modifications:

• Moving the machine into a new case - the Antec SLK3700 . This case can take two 120mm fans (bigger fans tend to produce less noise), has a rubber grommet mounting system for hard drives (reduces vibrations), and has a front door (reduces optical drive noise).
• Replacing the stock CPU heatsink with a Thermalright SLK-800U . This massive heatsink can take an 80mm fan. I'll use a Panaflo fan.
• Removing the northbridge chipset fan and replacing it with a heatsink .

Future modifications could include a quiet power supply, video card heatpipe cooler , and use of Fan Mates . We'll see how happy I am with the noise level after the first round of upgrades.