Check my system specs below. My DAW is about 8 months old, so a newer processor would be in order, but the rest of the components should be good still. I bought everything locally through Micro Center because prices were comparable to online parts houses. You may also want to consider having a system built by iBuyPower.com. They build PCs for gamers, but with the right sound card they are perfect for music production, too. Prices are competitive and they are guaranteed for three years! My PC is closely based on one of theirs.
Windows 7 Ultimate x64, Reason 7, BIAB 2013
Intel i5 2500K 3.3 Ghz, Gigabyte ZX77X-UD3H, 16 Gb Corsair DDR3 RAM
OCZ 60 Gb SSD, WD 1 Tb Caviar Black 7,200 RPM HD
Zotac/Nvidia GeForce GTX 560 2 Gb, NZXT H2 "Silent" case w/liquid cooling
Presonus AudioBox USB, Behringer B2031A, JBL PSW D110 sub
Kennesaw (Atlanta), Georgia, USA