I fell in love with my first SL as a twelve year old, when I saw the most beautiful champagne 450SL in a showroom for seventeen thousand dollars. As midlife approached I was able to afford a used 1999 SL500. I have driven over 50,000 trouble free miles and have consistently averaged over 20 miles per gallon. I believe the 129 model(90-01) is the least expensive to own from the perspective of a Mercedes-Benz mechanic.
Heated seats and Residual Heating(REST) after shutting off the engine.