A well-looked-after W210 should be a more satisfying car to drive than a W124. It is a different feel, particularly in the steering shift from recirculating ball to the rack & pinion setup. Also the newer autobox is far more responsive than the "I'll downshift when I am good and damn ready" 4-speed in our W124s.

One that's been beat-down and neglected though... I've also had the bug to find either a W124 or W210 wagon, but as you know wagons generally see very heavy family use/neglect, and they are often run into the ground.