We are in the twilight of GPU mining, but it's up to you to decide if it is worth it to you at this point.

You may want to take a look at the new Radeon 7790 too.  It isn't going to do as much per card as the 7950 (maybe around 300MH/s overclocked) but it is relatively cheap and seems very power efficient.

You might also look into an alternative wallet app like MultiBit, which doesn't download the full blockchain.  I'm not sure what (if any?) disadvantages this might have for the end user, but it certainly takes up less space.