Larry's comments are right on in my experience. These 124 series cars have received numerous accolades as being the best used car buy etc. I think there is a commitment level to have these cars run well for a long time, similiar to a Porsche.
I would also recommend looking for a car that has true documented service history. A E320 94/95 that has been well taken care of will last a long time with proper car.
They are very enjoyable and satisfying cars to own and to drive.
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)