If you want diesel (in the US), there is of course only one choice. But the E34 5-series definitely gives the W124 a run for its money. I think each is the best all-around car that its manufacturer has ever made.

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AlexTheSeal: hack mechanic, inadvertent drifting champ, builder of infernal devices, professional epistemologist

'87 300D Turbo, roadtrip mileage champ (for sale!)
'92 Isuzu Trooper, mudder extraordinaire (for sale!)
'82 Honda Silverwing, cockroach of motorcycles
And various boring daily drivers...