Mining Rig

[oldkolobok]

I came across an ad for a mining rig, im curious if its a good buy.
What would you pay for a rig with the following specs?

6x XFX 7950 3GB GDDR5
1x Asrock 870 Extreme 4
1x Frame
1x Athlon II
4x 2GB Ram
2x 1000W Power supply
1x 850W Power supply
1x 350 GB (HD?)

Also, what kind of hashrate would this produce?

Edit: moved to right board.