I don't know all the Canadian stuff ... but you don't need an FM2 to buy property. (the only exception to that has to do with Captial Gains tax when selling - just a rumor at this point). Also an expired FM3 is like you've never lived here and will have to start over.
Most Canadians I know can't be out of country over 6 months (or so) to keep a certain type of medical coverage. Other than that, no limits if it like SSI in the US.
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