Mid 80\'s Peugeots?
If it is in half decent shape, grab it. I don't have experience with the diesel engines, but my parents had two 505 gas sedans and they were tough, reliable, and comfortable cars. I knew their Citroen/Peugeot mechanic well, and he was quite fond of the turbodiesels, which gave him very little trouble. The one thing I would worry about is the ZF 4-speed automatic, which was used on the '87 for sure, and I think the '86 as well. Peugeot had a lot of trouble with them, as did BMW. The old ZF 3-speed automatic used through at least '84 or '85 was pretty indestructable, though. The five-speed manual is much better than either in my opinion, but a manual diesel wagon is rare, rare, rare . . . I once looked for a used one and found that the owners never get rid of them.
Other areas to check: the blower motor runs all the time, so it usually needs repalcement at some point. This isn't hard, but you do have to cut the fiberboard panel in front of the passenger-side firewall. With age, the power steering rack can get leaky, but so long as you don't run it dry the pump will hang in there. The plastic radiator tank can crack if the engine mounts are soft, due to the engine pulling on the upper hose. Aside from this, I can't think of much to worry about.