Built my rig back in summer 2010 on an ordinary-looking box. A sleeper of computers back in the day? I want an upgrade, but can't justify it and in any case I ahbor the thought of trying to use the cruel joke that is Windows 8.
I always said as a kid I was going to build my own mega gaming rig. Trouble is, by the time I had the money, I was 21, and didn't play that many games anymore. So I sank $700 into a computer that plays HD movies and runs Word, Firefox, and iTunes. The redeeming quality is my dual 23 inch screens that keep me distracted on GPF when I should be productive.
Here's the stats I could find courtesy of dxdiag and PC Wizard:
AMD Athlon II x4 635 @ 2.9
Gigabyte GA-880GM-UD2H
4GB DDR3 (upgraded to 8GB shortly after realizing what a resource hog Win7 was)
ATI Radeon 5750 @ 1024MB
1 TB Hitachi somesuch that's actually 2x500GB in a RAID 0. Added a Seagate Barracuda 2TB last year after catching a $79 Micro Center sale, so I'm up to 3TB.
I'm 99% sure the power supply is OCZ. It's 700W.
I'm going to cry the day my four year old RAID 0 setup takes a dump. I try to back it up regularly, but I'll probably question if the 30% speed gain was worth it when I lose several weeks of work.
(To the OP: your HD is by far the weak point. Although probably too late to suggest by now, I would run a SSD for the OS and other high-demand programs despite its lower capacity (in the 100GB range), and then put a mega 7200RPM hard drive for everything else - movies, etc.)
