Yeah sucks about the pads on the weekend.
As a comparison to a GTSt on streets and 260kw Tim did a low 28. With another 40kw he may be biting at your heels at a 26... Having said that he has less in his car being partially stripped.
2WD rocks! haha.
I think the difference between these two is that your GTR is only mildly tuned where as tim has done more to his engine and you could drive yours daily...
Dollars/fun wise I agree with Bris that you'd be hard pressed to get a better, cheaper, 'club style' race car than a GTSt or silvia.