I gotta go with the NSX-R if it where a stock race. That is straight line or track. If it where modded I would have to go with the Skyline. That thing is VERY easy modded, like the Supra.
I posted the same thing on the Skyline board, and had SOOOOOO many people laugh at me and tell me that the Skyline punishes every other Japanese car-but then again what do they know?