In Canada, finding a W210 that doesn't have rust is going to be a difficult task. They are fantastic cars, and I've owned 5 w210 diesels and never had a major issue. But rust does them dirty. I'd stay away from W220s as well considering they rust just as bad, and if not properly maintained are money pits. There's too many electronics and costly repairs even with my own labor that steers me away from owning those.

A properly maintained early w211 with the 722.6 is a great bet. I foresee owning a E350 in my future. Great cars, but do require a scantool unless you like paying mechanics. I personally don't like paying someone for something I can do myself the right way.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k