Keep in mind where you live. I do a lot of driving in DC, and the city roads are pretty bad. I think the ride would be too stiff if I had put the HDs on. My w124 coupe feels harsh in the city compared to the w123. Besides, you aren't really going to enhance the handling of the w123 no matter what you do, so I'd say just put in the comforts, sit back, and enjoy the ride!

GregS
'84 300D
'90 300CE