Well the 760 comes with 1GB less VRAM but is slightly faster at 1080p (techpowerup)than the 7950 so it is up to you really.
As for a OC, every card is different thanks to the annoying silicon lottery that I have never won
EDIT: forgot to mention the 760 will consume less power and should run cooler
As for a OC, every card is different thanks to the annoying silicon lottery that I have never won

EDIT: forgot to mention the 760 will consume less power and should run cooler