BTW, this is the PSU I would suggest and also has been suggested a lot by DannyBui for being a solid budget PSU for most of the new builds going on:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371031
It comes with 1 6+2 pin and 1 6 pin which is what you need for the 6970 and has 48A on the 12V rail so should have more than enough power for your system.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371031
It comes with 1 6+2 pin and 1 6 pin which is what you need for the 6970 and has 48A on the 12V rail so should have more than enough power for your system.