The 7950 3GB is a 299.99$ card from Newegg, which is cheaper than the 760 upon release which is 209£ or 316$ (conversion). The 7950 will run better on stock than the 760, it will run MUCH better overclocked (built-in feature, so you cant screw it up), BUT the card will run hotter and consume more power than the 760.
Comparing dollars to dollars, the 760 is $50 cheaper... In the US, the 7950 is $300 and the 760 is $250.
Not sure where you're getting your info, but...