Asus Crosshair IV Formula motherboard
AMD Phenom II X2 555 3.2GHz CPU
250 GB hard drive (No OS, wiped clean)
XFX Radeon 6950 (340 MH/s)
Asus Radeon 6870 (300 MH/s)
Sapphire Radeon 5870 (380 MH/s)
Corsair GS800 800 Watt power supply
2x VGA dummy plugs
With a little overclocking this rig can get over 1 GH/s. I can give you the overclocking settings that I figured out for the cards.
No case, I ran this open-air just fine. BTW, that motherboard is badass. I bought it because it would fit 3 video cards, only after I got it home did I discover how awesome it is.
Asking $1100 CDN, plus shipping. Will accept Paypal or BTC. Canadian buyer prefered, but not required.