I drove my friend's GT500 and it's a nice car. But I wouldn't trade my Z for it in a million years. The GT500 feels like it's 5,000lbs and you're immersed deep in the middle of all of it. Also, my Z with HFCs and a Stillen exhaust sounds meaner than his stock GT500. Could his GT500 smoke his tires off and get him to 1/4mi faster than my Z? Sure. But does it have the handling feedback and poise of the Z? Not even close. And for the price of the GT500, I can supercharge my 370 which would leave the GT500 behind me on any track.
In short, welcome to the370Z.com. You now have a much better car