The 2.2 with the standard transmission is a more serviceable car than the same engine with the automatic. The fuel milage is the highest of any of the older mercedes as well. This is well documented.

So it boils down to the cars condition. It should be really examined overall by a mechanic really familiar with them. You do not want a moneypit type of situation.

Some plus factors are the engine is a little quieter and can start up really cold easier than the 616 and 617 engines.