The R129 is nearly two model changes old now if you include the Batmobile-like '09 SL, and high-mileage versions can be had for around $15K.
The engine is pretty solid, and brake replacement is akin to the W124 setup, but your biggest headache will be the convertible top operation. Usually the front latch actuators leak and need to be replaced. But at least it's a DIY fix.
Those beefy tires aren't cheap though.
We've enjoyed our 95 SL before trading up to the 01 CLK. Spent very little on repairs.
