"There is nothing more expensive than a cheap Mercedes-Benz"

I have to take issue with this. In my experience (going back to 1972) Mercedes parts are no more expensive than similar parts for American cars, you don't need as many of them, and the cars are substantial enough and well made enough that they are relatively easy to fix.

As I am my own mechanic, excessive labor rates don't bother me.

If you doubt what I am saying go out and buy a mid 80's Cadillac, Lincoln or even a Ford or Pontiac with over 150,000 miles on it and try to restore it and drive it as everyday transportation. Within a week you will run screaming back to the arms of your Mercedes.