I have my custom-built gaming rig up for sale. I built this machine myself last year and have recently moved. Unfortunately, I don't have room for a full tower desktop in my new apartment. My loss is your gain. All components were hand-picked and assembled by myself. The machine has the following specs:
Intel Core i7 920 D0 CPU
Asus P6T Motherboard
12 GB RAM Corsair Dominator DDR3 1600 MHz (XMP enabled)
60 GB Vertex SSD
Antec 1200 Case
Corsair 750TX PSU
Coolermaster V8 CPU Heatsink
1GB BFG Tech GTX285 GPU
Samsung SATA 20X DVD±RW LightScribe DL DVD Drive
This system is also available with (1) or (2) AMD Radeon HD6990 GPU's, instead of the GTX285. If buying the system, factor in an additional $600 per 6990 GPU. The system will come with a blank SSD, and you will need to install an OS. I previously ran Windows 7 x64 on this system and it was blistering fast. The i7 920 D0 is a very overclockable CPU, so this system can be easily overclocked with a bit of patience.
Looking to get $1500 USD for this setup, with the GTX285. I will accept BTC and Paypal.