From the models you listed, it sounds like you are only looking for a 1986-91 W126?

For less money and just as nice looking of a car, you should also consider the 1981-85 W126, which includes the 300SD, 380SE, 380SEL, 500SEL, 380SEC, and 500SEC. The "SEC" are 2-doors however, but beautiful cars I think. Also some Euro models with this W126 chassis, which include a 280SE, 280SEL, etc, but not as many as the others listed.

You can probably buy a nice 81-85 W126, for much less $ than a 86-91 W126.