I have been an AMD fanboy, since getting screwed back around 2001 by Intel's 820 chipset and Rambus...Ugh brings back nightmares thinking of that machine.
With that said I think I may be ready to try Intel again, after reading the latest Maximum PC, dream machine 11 review. This year they built an Intel Core 2 duo based system, they stated that it ran so cool they removed the heatsink/fan and it ran within operating temps, I wouldn't recommend that but that shows you won't need a bunch of noisy fans in the case ...
So if I was going to build a quiet computer, (which I probably will in a years time) I would get the Antec
P180B or the
Sonatta II Case Intel Core Duo2 probally keep my Western Digital
WD3200KS (16MB cache sataII) extremly quiet, fast and reliable, and add a
Seagate 750GB for media storage, PC Power and Cooling
Ultra Quiet Power Supply Stick with name brand ram (Corsair or Crucial) For a motherboard there is a new Nvida Chipset coming out soon for the core 2 duo.
Right now I have a DFI Lanparty NF4+. Athlon 64 3200+, 1GB Corsair XMS (matched) Geforce 6200 PciE, WD WD3200KS, Emu0404, Audigy (for the few games I play)
A-Top XBlade Case