[Technogeek]

Well the good thing is, your not going to have to spend a lot of money on a GPU becuase you don't want to game with this rig. That way you can invest other things. I would get the Q6600. It's a great CPU, and you can OC if you want. As for a good case, I would consider one that's not all about looks (as your not going to be adding lights to impress people), and look for good air flow, lots of HDD space, and price.

As for a PSU, your not going to be adding in any high end graphic cards, so you could get something around a 600w PSU, and have plenty of power for things like optical drives and HDD's. Just go with a good brand, like OCZ, PC Power and Cooling, Thermaltake.

Remember if you plan on getting 4GB of RAM, you will need a x64 bit OS.

I have a home studio, and I use the rig in my sig for all my audio/MIDI work. I have a PreSonus Firepod for my interface, and with my system, I have recorded a gutiar player, a keyboard player, a sax player, at the same time I was sending MIDI to one keyboard, and everything running though my mixer back into my PC with no issues. I also use Cakewalk Sonar 6 Pro x64 bit, and it's very fast.

Good luck, and let us know what you decided on.