I know what you mean. For me, the ultimate would be a 1982-85 (the best years) Mercedes Benz 300TD. It's a station wagon version of the W123 chassis, and has the OM 617 3 liter turbo diesel engine in it. I would convert it to a manual trans using parts from a 240D. The automatics are the Achilles heel of these cars as the vacuum system that shifts them goes out and destroys the trans. That, and rust on the older models ( they fixed it in 1982).
I just love the look of these cars. They are the last of the chrome bumper Benzes, and are so well made that many of them exceed one million miles on one engine.