Thanks for all of the great information so far, especially the sobering advice that there is nothing more expensive than a cheap Mercedes

.
This will be my mantra as I check out the 560s and 420s in the local market, as they range from $2,500 to $12,500 for 1987 to 1990 vintages.
I may look at a 300sel just for the sake of comparison. However. I have grown accustomed to the 275 hp / 300 torque that the Northstar puts out, so I will probably go for a V8.
A good friend in Australia recommended a Euro spec 500sel and predicted that there may be a few kicking around in Canada. I found one, with velour upholstery, which originally turned me off. When I checked again, it was sold.
Jas