I did a search and answered my own question. I'm going with the Sachs which it seems would get me closest to the original ride. I understand Bilstein Comforts are probably similar in ride quality, but they cost more. I can get the HDs for the same price as the Sachs but am not willing to go "stiffer" in ride. The warranty on the Sachs is lifetime, just like the Bilstein.

This W210 is a seldom-used passenger car, not a canyon carver - I have the Miata for that.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280