Its still pretty good mate. Youll find a ton of ppl on here that say "yeh its definatly worth it for you to upgrade to gtx blah blah blah.."
Truth is it really isnt. 7950gt can handle most games on max everything and you dont need the few extra frames doing nothing for you.
ANd before someone shouts direct x 10, they dont even do that well in it for the very small image quality boost.
Geforce 9 series is right around the corner mate, once that is released 2 things will happen, G80's come way down in price probly to the performance level, and the new high end card will be the G9 series top card, which will be a REALLY powerful card.
Better of saving your money and staying with yours until those 2 things happen.