I vote for the 300sd it can be as good as any 240d anytime. Take it to a good shop and have them check it out. If there is not much work need to do and you don't mind doing it go for it. I have had and driven both 240d and 300sd and the sd is the smoothes ride. Yea little things go wrong but as long as the engine and trans. is in good shape little thing can be worked on when you have time.
Bill

__________________
94 dodge cummings,86 ford 6.9,75 mbz 240d[ sold], 82 mbz 300sd,83 mbz 300sd