123 300d. not the sexiest MB, but probably the most rational choice. I really like mine. Just the right size.

On the other hand, why not just drive what you already have?

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'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E