Been running this for the past few months, purchase through ebay.
First desktop upgrade in about 6 years for me. Got a real GPU this time. Shaders = on
Processor: AMD FX(tm)-8320 Eight-Core Processor
Motherboard: ASUS M5A78L-M/USB3
PSU: 500 Watt
RAM: Corsair Vengeance 8gb DDR3 1600mhz (x1)
Disk: 1TB Hitachi, 7200rpm
GPU: Palit NVIDIA GT 610 2gb
Sound: NVIDIA GF119 HDMI Audio Controller
Fans: 2x120mm (front/rear), 1x80mm (side)
Optical Drive : 24x Dual Layer DVD Writer
Connections : 6 x USB 2.0 / 2 x USB 3.0 / LAN / Sound
Case: Galaxy Evolution (black)
OS: Kubuntu 13.04 x86_64
Price paid: £381.
Pic of case (fans can change colour on demand):

Desktop:

Would have installed a dual boot Slackware/FreeBSD setup again, although i've taken an interest in Steam lately, and Kubuntu seems a sensible option cause it just works without any fiddling needed.
Cube2 based games run without obvious lag on full settings (minus motion blur/bloom) at 1440x900 resolution. So it's not too bad (even though cheap end GPU), cpu is wicked though, compiles Red Eclipse in 22 seconds after a `make clean' lol.