Lots of previous threads on this--try a search, then settle back for a few hours of reading.
I drove my 240D 30,000 miles in a year. I loved every single mile except one particular on ramp to the Baltimore beltway--not enough room to get up to speed .
You need to develop the attitude that the 240D is adequately powered and that everyone else is just in too much of a hurry. You can't blame them, after all they aren't driving a great, classic Benz!
The beauty of the 240D lies in its simplicity, and its longevity. Accept that or don't drive it. Do not turbo the 4 cylinder engine--it wasn't made for that. The turbo will reduce the longevity by a significant amount.
When you say "no rust". Make sure thats true--not just the painted areas, but under the car. Check carefully around the jack points and the rear suspension mounts. Check the floors, too, as thats where water will collect.