When you buy a GT3, just be careful of the radiators. They are known to crack and break, my friend is on #3 at 25K miles. I actually broke his first one at 400 miles when my 350 on slick shot a rock into his radiator....
Also the GT3 transmission isn't that great in my opinion. It feels extremely tight and clunky, the throw is extremely long too. Think FWD Hondas with super tight gates. The car does sound awesome. This is sound recorded from the helmet cam. If it is that loud inside the car, think how noisy it is outside. I also only hit 7800RPM or so, imagine what it sounds like at 8400!!!!
http://www.youtube.com/watch?v=sjc2pZflaz8
I don't recall what hte GTR sounds like inside, it's been 3 years since i last drove one.