I'd build something like this:
Mobo: Asus P5B Deluxe
CPU: Intel E6600 at least with 4mb
Heatsink: Scythe Ninja REV-A (not B)
RAM: Corsair, Geil or Kingston, 800Mhz, CL3, at least 2GB
HD: 10k RPM Raptor for audio, and some Seagate for system
Video Card: anything without fan and no more than 128 or 256mb
Case: Antec P180b with minimum fans installed
PSU: Antec or Enermax Liberty 350w - 500w
CDRW: Any quiet model by Plextor, Pioneer or Nec would be nice
Display: Eizo 19XX series are great for studio environment, but not cheap.
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