Being a little older, and having come up through the tail end of the muscle car era, I've already owned most of the cars I'd have on my list, though I wouldn't mind having some of them back now.
'70 Mach 1, 428, 4 speed, Red on Black with the slats and the wing (owned it in high school)
'71 Challenger RT convertible, 340, 4 speed, triple blue (owned it in high school)
'70 Hemi Cuda, 426, 4 speed, no options at all (owned it in high school, never ran)
Those are a few I'd love to have back. As to what the list would like today?
Ford GT
Lamborghini Miura
Renault R5 Turbo (the panel flare version)
Festiva ShoGun
Porsche 914-6 with a 3.2 swap
That would keep me busy for a while.
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