BMW 2800CS/3.0CS, Karmann Ghias, BMW 2002's, Porsche 912's, Porsche 914's, and of course Volvo P1800's are my bets. If you want to go a little bit more blue chip, the Countach and the Testarossa are SKYROCKETING in value, even more so than the 300SL's (comparatively).

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[GONE] - 1995 Mercedes E300 Diesel - 130k miles - Smoke Silver (702) over Mushroom leather (265) - Bladder blasting, coast-to-coast work machine.