first of all, that is an extremely high price for a NA diesel with that mileage on it.
The turbo will out-run a non turbo. Drive it and you'll see (and feel) the difference.
That said, a non turbo with a stick transmission is the most reliable combination next to the 4 cyl 240D that MB ever made. An automatic transmission on the non turbo is something not well adapted to modern traffic and the way people drive they will be honking at you to get out of the way
