Hi,

Would like to get help for the required configuration of a PC for first mining rig.

I have availability of either of the GPU cards:

Asus EAH5850 DirectCU / 2DIS / 1GD5 @ US$220/-
Asus EAH6950 / 2DI2S / 2GD5 @ US$350/-
HIS HD 6750 Fan 1GB GDDR5 @ US$110/-

Please give your suggestions with the PC configuration I should go with to start the BitCoin mining rig.