Manny,
I would agree with you, 90k is low mileage (especially when I consider the mileage of the cars I've owned in the past!). However, I was wondering how easy it would be to sell one that had 120k+ on it? Some people do get spooked when the miles approach 100k. Why, I don't know. Granted, most people do associate MB's with durability, so it's not the same as a 125k mile Kia, if there is such a thing!
I think the only way I'd buy one is with complete records. The detailing I can take care of, so that's not a huge problem. Mechanical repairs I leave to the mechanics.
-DavidM