Every article I've read about this has mentioned putting an i7 and a 5870 in there, but I don't see how, the 5870 needs a big PSU, how many ITX cases support a long GPU and ATX PSU? Exactly.
Even so, the price this thing will be (won't be low, things never are) you'd be better with a matx board.
Silverstone SG05B | i3 530 | Scythe Shuriken | DFI LanParty MI P55-T36 | 4GB Kingston HyperX 1333Mhz | XFX 5450 512MB | Samsung SN-T083C | Intel X25-V 40GB | Samsung F1 1TB
LGW2452TX-PF | Logitech G9 | Logitech G15 | Logitech Z5500