Hes not asking about the GT300/500 cars though is he? So that won't be off much use to him. Hes on about the 3000GT, which is made by Mitsubishi.
3000GT VR-4 Turbo is the most powerful, they all use the same chassis so will all handle the same way basicly. VR-4 Turbo has the most power, so for power and handling that's the one you will want