Really? I've always heard good things about how 300zx's handle. Yeah the TT models are really hard to find these days with a reasonable amount of mileage. So far all I know about the drawbacks are bad fuel injectors and A/C issues.
When I was looking some while ago (um, about 10 years ago) I thought a 300zx would be a good buy and then started talking to various people about them and was put off by the comments about how they handle in the wet, and also the costs for when the turbo's go bang. I do have a friend with a very nice one which he drives extremely well (and including on the occasional wet track days we have), but his skill level is pretty good - he's tinkering with it currently at around 415kw.
Anyway I ended up with an 96NA Supra at the time and later had the option to get a TT (since with a single conversion) and it's just rolled past 54000km (about 40k miles).
Most of the track days I do I end up playing with the GTRs and other Supras.