Just my .02...
the radiator probably will not be problematic on a 95. And the wiring harness isn't that big a pain, its just money. With 87k , the dealer may get some goodwill from MB. Use it as leverage. It's about a 1.5 hour fix for a good wrench. I'd also make sure the wipers are working properly as the 94/95 cars already have begun to have the cheaper lower quality parts that began in the middle 90's. If it runs very slow, you're in for a wiper motor. And yes, the leaky cylinder head is typical and should be repaired. Overall, these are excellent wagons.