Holy Crap, a GT-R transmission can't stand up to track use? Sad.
I bought an M3, as a guy who had never set tire on a track, so that I could have a track car. This spring I get to start learning. There are other options I guess. But one consideration is age. A man reaches a certain age (I'm there) where almost any trackable car will make him look like Lord Farquad. Midlife crisis city, or compensating for something. But no worries with the M3.