If using raw audio and making a lot of edits I would use a HDD for storage, a SSD is still great for an OS drive, but I would get a smaller one to save money there and get a nice big hard drive for storage (Probably a 1TB Western Digital caviar or Seagate Barracuda can be had around $70)
I would get at least a 600w Power supply for an i5 system for the best efficiency and upgrade-ability. as a preference I go with Corsair units as they are rock solid dependable even under abuse, other brands to go with: Thermaltake, PCPower & Cooling, seasonic, Antec Earthwatts, XFX, EVGA, and some OCZ units. I would never go with the off-brands I didn't list (
Apevia, Coolmax, CoolerMaster to name a few)
But thats a strong CPU that should do whatever you need it to, good RAM, soundcard, and a compatible board

-Austin
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not-so-crappy 775 System:
Q8400 @ 3.8GHz 1.37v 24/7 - GA-EP45-UD3R v1.1 F12 - 4GB (2x2) OCZ Reaper HPC DDR2 1066 CL5 2.1v
EVGA GTX460 1GB 815/1950, w/ ACER 23" 1920x1080 TV & Dell UltraSharp 20" 1600x1200
In Progress: ThermalTake Armor A90 chassis function modded, 2x4GB GSKILL RipjawsX DDR3 2133 CL9, Corsair HX-750w
Remaining: Board / CPU / other 2x4GB CL9 ripjaws kit / GPU upgrade