I wouldn't even debate it, I'd way rather have a clean fox then a 2000 GT. I had an 89 GT and a 90 GT. The foxes are much lighter and fun to drive IMO.
I know alot of people would say that it's a no brainer and to stick with the fox, but I'm a big fan of the new edge GT's. They look great and have an underdog status that makes a fast one very suprising to most people. That being said, it is hard to argue with a clean fox, lol. I don't think you'll go wrong with either choice.