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I know my friend can floor his 370Z 'vert (stock) at 40mph with the sport package and light up the slippery-light. I can't imagine that the open-diff would be good for performance applications regarding accleration/traction. There was a whole thread a while back about people (myself included) who wondered why the Z was so easy to break-loose at speed when you stab the throttle. I have never been in a car like that before. Even the C6 I played with didn't do it.

My .02? I have never owned but 1 car with an open diff (My G20 beater). I wouldn't ever own another. Even in the DD it sucks. One time when it was raining, right after I had traded my last car for this G20, I floored it trying to get out into busy traffic. It just sat there and spun 1 tire and moved about 2' and I had to put it in reverse and get the nose out of traffic. I have driven similarly slow cars to the G20 before, but they had a posi-trak (Ford) diff. Never had that issue.

As to the brakes, the 370Z that ate the wall was due to the brake-fluid from what I understand.

The main source of NVH in these comes from the tires and road-noise and almost total lack of insulation. Buy some dynamat or something and it will make WAY more difference than sport/non-sport, and only set you back 8-15#, depending on how aggressive you get with it.