These are the specs I'm looking at for a PT rig like the OP. I gotta see if I can get better than 4x1GB RAM so when I upgrade, I don't have to throw away RAM, also must make sure the mobo can take more for when Digidesign eventually go 64bit. If anyone can suggest any other improvements, I'd love to hear them!
CPU: Intel Q6700 2.66GHz QUAD CORE
COOLING: 120mm CPU cooler and exhaust fan
MAINBOARD: Gigabyte P45
RAM: 4GB (4x1GB) DDR2 800MHz Corsair
HDD1: 320GB OS drive
HDD2: 500GB Audio drive
PSU: 500W Seasonic
GPU: HD3450 ATI dual ouput silent cooling
OPTICAL: DVD R/RW
FIREWIRE: 2x Texas Instrument firewire ports
CASE: 19" Rack case with acoustic insulation
OS: Windows XP Home custom install