Having owned and driven an 85 300TD OM617, a 300E 3.2 M104 and a 91 300TE M103, I'd be happiest with a 93-97 wagon with an M104, ABS and airbags.

The M104 was far more powerful and economical than the other motors until losing a head gasket at 360K miles. IIRC the 96-97 wagons (not sure of the W designation) also have an improved transmission. 123 wagons are getting a little tough to get wagon specific parts for but they are increasing in value. The M103 is still going at 312K miles but isn't close to the M104 in performance.

Unfortunately I don't know about the availability of euro models, so I cannot answer your exact question. Will follow the thread to learn what euro options exist.

Good luck and thank you for your service, it is appreciated.

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer