I'm skeptical that a good W210 can be found for less than $10k. I have been stopping at used car lots and most seem to be kind of beat. It may be possible, but its going to be hard.

Their is a 1996 S320 for sale not to far from me for $7k, it looks really nice!

If you can live with a smaller car, I'd look for a 4 cylinder C class.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200