GTX670 just came out, it is faster then 7950, you can find a lot of reviews.
http://videocardz.com/32846/geforce-...-cards-roundup
I would recommend you models with big PCB.
And if you going to OC ( which is easy ) models with 8+6 pin power connectors.
If you intend to use your PC only for gaming and not for rendering or heavy video editing you can go with i5-3570K,
and save some money.