I know alittle about the canadian market, (see my signature), and I can honestly say this, the mercedes are cheaper in the us, hands down, you can get a better example cheaper.

Unless you find a immaculate car, or a southern car you are gonna have to deal with rust, the key points on the W126 are the front guide rod mounts, the jack points, and the frame rails at the front.

2 of my mbs are southern cars, 2 others Im in a constant battle with iron oxide. and of course my landcruisers are magnets for rust, (in fact parking my landcruiser next to my mercedes causes the rust to jump from the mercedes to the truck.

The rust on the first mercedes didnt look to bad, and those diesel leaks are pretty common. but with 300K km i think its a 1500 car max.

Mercedes in montreal seam to cost alittle more than the ones here in london ontario.

I just sold a 300 SD with 300K km on it, good body minor rust but near perfect underbody and suspension, with a mint interior, and a excellent engine for 3K,

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1984 Euro 300SDC, (4spd standard)
1986 Toyota Landcruiser Diesel HJ60 5spd X2

Gone but not forgotten (some sold, some stripped)
1983 300 SD, 1985 300 SD, 1983 240D, 1986 300 SDL, 1985 300 SDL, 1983 300 D, 1984 300 D, 1985 300SD, 1987 300 SDL, 1983 300 SD, 1985 300 TD Euro, 1983 380SEC, 1990 300 D, 1987 300D, 1982 300D, 1982 300D, 1994 E420, 1987 300 TD, 1987 300 D, 1984 300 D