I have 2 computers I can combine into one. I use windows 7, with guiminer from 07-01-2011 with the phatk2 kernel. You might be able to get more performance with newer versions, but I'm lazy.
3x5850 @ .95V @ 710/300 pulls around 400W from the wall. 293 Mhash/ea
PC Power and Cooling 610W
2x5970 @ 1.024V @ 770/300 pulls around 650W from the wall. 358 Mhash/ea
some i7 mobo and i7 930, 3 cores powered down.
Xion 1250W PSU
CM HAF 932
The GD70 has enough slots to fit all the cards, but you'll need 1 extender. The 1250w PSU should be able to handle all the cards, but that's untested.Theoretical Ghash performance slightly over 2.3Ghash for ~1100W, 2.09 Mhash/W. Offer me. All the cards, mobo, cpu, psu are warrantied and bought within the last 9 months and have varying warranty terms. Most likely won't ship a case with it because it makes no sense to ship something that heavy.