I would go with the RX-7 for over all performance. The Skyline is not all that greats in the twisties. The RX-7 is a very light nimble car, that has good throtle response and cornering abilitiies. The Celica with nitrous would probably hold up with it, but if there are alot of corners the RX would beat it. The Supra is way too heavy, and the Skyline, as good as it may be has an oversteer problem. The MR-2 with a few mods would hold its own, but mod for mod still sticking with the RX-7