If one were wise, you could take a 123TD wagon that was in generally good condition, and blow $10K on overhauling it from bumper to bumper, not unlike one would do with an airplane flown in part 135/commercial service, there isnt much that could hold a candle to it. Of course there would be a sorting period where some failures would raise their ugly head, but if the parts were of Mercedes quality, it should be equal to what it was when new. And no one could argue they were not worth every penny what they sold for new.

The 124TD is equally a good candidate for the above.