Urgent - Kindly help me select the power supply

Hello Friends,

I have ordered the AMD HD 6950 2GB. Going to unlock it to Hd 6970. I have Core i7 2600K and an Asus P8P67 Pro b3.

I was thinking of Going towards Corsair GS700W Gamer Series Power Supply. ( I am in India ).

But I heard that it was not that much good. Also I was Offered a Corsair CMPSU 750TX at a bargain. Should I go with 750TX?

Will the 750TX ( Older version ) be able to power up my HD 6950? ( It is not certified by AMD website ).

Links:

Corsair 750TX :http://www.corsair.com/tx750w.html
Cosrair GS700W : http://www.corsair.com/gs700w.html

Kindly give me advice on what I should Go.