BE SURE IT IS WHAT YOU WANT. I would probably steer you toward a more modern gas burner or, if you have to get a 123, I'd suggest the CD if you can find one.
The 110 was a good engine when new, but now they are a problem to get worked on because of the age.
The D's will always be easy to get repaired.
Just my thought.
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS