Here is the PC “barebones kit” that I ordered a few years ago and have continued upgrading when needed. I know some are going to say it is not that powerful, but it is better than some, and for the price, it is cheaper to build, than buying a new one every few years. Here are the specs:
Ultra Black Defender ATX Mid-Tower Case with Front USB Ports and 400 Watt XVS Modular Power Supply
Asus A8N SLI Premium NVIDIA Socket 939 ATX Motherboard
AMD Athlon(tm) 64 X2 Dual Core Processor 4200+
Ultra 1024MB PC3200 DDR 400MHz Memory (x4) 4Gb total
XFX GeForce 7600 GS / 512MB GDDR2 / SLI / PCI Express / Dual DVI / HDTV / Video Card (x2)
Acer AL1917WABD / 19″ Wide / 5ms / WSXGA+ 1440 x 900 / DVI / Black / LCD Monitor
Seagate 320GB Serial ATA HD 7200/16MB/SATA-3G running 310Gb Linux. 
, 10Gb XP sometimes.
For extra storage also a
Seagate 120Gig Hard Drive partitioned into 3 parts, 2 of 30Gigs, and 1 of 60Gigs (for sharing on the network)
Britz 2100s speakers, specs are at bottom of page in English.
HP DVD840I DVD Writer with LightScribe (x2)
Fantom Drive External DVD +-R/+-RW
HP Internet Access Keyboard
Logitech G5 Laserl Mouse
Logitech Extreme Gaming Headset
[BFG Technologies] RATPADZ GS
