If you do your own work they can be downright inexpensive to own. A 94 SL320 would be a nice choice - the first year of the 3.2 104 motor and the only 3.2 without standard traction control, although the ETS system standard in 95 seems to be less troublesome than ASR. The only way to avoid standard ASR on the 500s is the 1990 to 1992 CIS cars.

I think what remains strong on the 107 market is just asking prices, not selling prices. Owners are very proud of their cars but buyers are few and far between. I think it's a market characterized by a very wide buy-sell gap and very little turnover.