I think we have seen the close of the muscle car era. Starting with the new GTO, Detroit brought out some cool, RWD V-8 cars but Obama is not going to let Detroit build any more. These cars are modern, fairly reliable, with more horsepower and torque than the original muscle cars, with far better usability and comfort. Cars such as a GTO, G8, and Chrysler 300 R/T and Magnum. These are cool cars with great power and decent handling, that look good and have few compromises. And the window in which they were produced is pretty small. Not a lot were built and I don't think they'll build anything comparable any time in the distantly foreseeable future. Even sedans will be sought after, and I think the Magnum will be particularly sought after.
Other cars? 911SC and Carrera. Classic 911 look and feel. I've been thinking about the old question, "What's a real Porsche?" and I've decided the air-cooled cars are their own beast, a special subset of Porsches. They are unique because of their feel. SCs and Carreras have that feel while the later cars began to lose that feel. That feel is unique, or at least very rare, among all manufacturers and no modern car has it. [Although an Elise is in that direction.] There will always be people who want that feel and the supply of cars with it diminishing.
It seems like a trope, but E36 M3. If they are so awesome now and so desired, demand will continue.
Not in response to the original poster, but to others following this thread: Things to remember about the stocks versus collectibles (especially cars) dilemma:
1. Stocks are almost free to own. Cars must be maintained, insured and stored.
2. Cars physically deteriorate over time. Stocks don't.
3. Most stocks are easy to value at any time (look it up online). Cars are much more difficult to value.
4. Selling stock is generally fast and easy and cheap. Finding the right buyer for a car is time-consuming and expensive. [I think Barrett-Jackson, for example, charges 15% plus a fee.]
5. There is a very large, extremely well-funded industry picking stocks and you have to compete with them. Nice thing about collectibles is that you're competition is not as difficult.
David