GTX 680 will be good to go.
7970 lies below it.
Ghz edition is just OCed 7970 compared to Stock GTX 680.
So OC GTX 680 and you'll surpass that Card.
But if you are tight on Budget 7970 is also a good idea.
You can OC it above 1Ghz and make it "Yourself Made Ghz Edition".
For Recording purpose you'll probably need a good CPU.
I think you must have one, Right?