this is an interesting topic....I dont think that any cars will be like the 1930-1970's cars where people buy them to restore them and can sell them all done up and make a living off of it, just because of the added cost of customizing any newer vehicles.
i don't think any of these newwer cars will stand up to the older ones cause they use alot of technology that can be easily damaged unlike the classic cars. also there isn't a strong brother hood following import as there are for american.
but if i had to say i would say a gen 3-3.5 cam, 2nd gen mr2, supraTT,last rwd celica, gt4, rwd rolla.
I'm not seeing too much that would go classic at this point. Perhaps an 05 Mustang GT given the complete overhaul of the frame may fit a niche, but were talking 30 years until they start to have a chance of reclaiming their initial price. Making a profit...40 or more years, and it has to be museum quality...
The impala ss based off the caprice chassis has some chance however among the muscle crowd.