A DAW does not need gamer type power/speed BUT should run quiet. Quiet=cool. A cool running system needs less fan rpms. That makes the Athlon 64 Venice 3000 a real sweet chip. I like the ECS FN1 Extreme mobo-why? very state of the art AND one pci slot is especilly CLEAN signal for a high end soundcard. It is an N-Force 4 mobo-and so there is a fairly loud chipset fan you will want to remove. The chipset heatsink minus fan is okay if you do NOT overclock and have decent ventilaation. Check Newegg for your parts great source. Samsung spinpoint SATA 2 HD,fast+quiet. Artic Cooling Silentium Case. Zalman,or Artic Cooling CPU heatsink...lok for low rpm.
I think the esi Juli@ replaced the Waveterminal,Zzounds.com has them,Newegg has M-Audio's line,nice price on multichannel. Vid card should be a FANLESS. The ECS mobo is pci-express so a basic pci-e Radeon is a good pick. Go to SilentPC Review.com for a zillion silencing ideas,such as mounting HD's The Silentium case already gives a nice low noise layout. Samsung Spinright HD's generally are in 120 or 160 gb. 160 is a lot,but if you intend to do video,get 2. My Lite-On has been a solid CD burner so I'd recommend the Lite-On 16x Double-Layer DVD burner at newegg,it does CDs at 48x,ALL formats of DVD + CD