I disagree that 7970 is way better. The advantages it has is in price. Performance is more or less a wash. And it took driver optimizations on AMD's part to get to that point. Months after it was released.
I have 2 reference 680s, they are quiet, use less power than the 7970's and nvidia is always on top of their game when it comes to driver support for newly released games.
That said, the 7970 is a better value for sure. Both cards will be overkill on your 720p TV.
I said 7970+ SSD not only 7970.
So no need add that comment.
And consider getting a monitor like derza said