those are all alright ideas (minus the tesla) though I think for the future of "collector" cars you have to look at what cars are popular with younger kids. I seriously think pretty much anything in the movie Cars or possible the Fast and Furious movies will probably have a decent shot at being the next collector cars for the current "younger" generation.
If we are not limited to new cars, I would get a 1969 Corvette Stingray, or a 1932 Ford Highboy roadster