Shelby AC Cobra 427 would be first choice.
Ford GT would be second choice.
Porsche Carrera GT would be next.
Lamborghini Countach and/or the new Gallardo
Mini-Cooper GT would be last.
My favorite Ferrari is the Maranello, but for classic Ferrari, it would be the 308GTB.
My favorite Corvette is the 1958 model.
My favorite Thunderbird is the 1957 model.
I would own all of the above, if I could afford it, but until then, I'll stick with the old Infinity I30 I drive right now.