There's actually quite a bit of live data available on the LH cars as well ('93-'95). OBDII is a catch 22. There are a lot more things monitored to set codes, but more specific codes to facilitate diagnosis.

As with any Mercedes, the important thing is getting a good car. Service records will reveal the true attention paid by past owners as well as highlight recurring problems.

Check everything in the car. Make sure the top works well (even if it has the hard top on it). Same for A/C. Drive several cars, run them through the rev range and monitor how they pull and shift. It's worth having the car checked out for a couple hundred bucks including codes, leak test, etc.

My $0.02.

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-Carl
Principal, BergWerks