http://www.wootware.co.za/powercolor...mb-raider.html
http://www.rebeltech.co.za/index.php...oducts_id=9063
http://www.wootware.co.za/powercolor...-infinite.html

Only after that can you even start looking at Nvidia cards and even then the 660ti comes in at R3200 and its slower than the 7950.

Also the Prototype driver is launching in 5 days and that promises to bring more performance and no stuttering for CF.
There really is no reason to buy nvidia at the current price point. AMD are way better value for money.