I think it's just a matter of time before GPU mining is dead, with ASIC products pushing multiple GH/s and FPGA pushing near 1GH/s I think the end is near to be able to financially motivate a GPU rig.
As others have already posted, I wouldn't touch this company with a 2x4 plank before I start to see some product. All the pre-orders they have taken, good cash flow.. Maybe they got all the rigs on a shelf mining for them selfs (speculation, i have no idea).
You are pretty close to maxing out.. There are some parameters people are running further down in the threadon the 7970 cards. I was thinking of the same setup earlier but with TriFire, I can't motive it financially however.