Having 241,000 miles on my 124, I feel the original purchase price of this car equaled two $23,000 300E's. How far will she go I wonder -- I'll be ecstactic at 315k, anything after will be more gravy. If MB came out with a model today w/o all the gizmos and similar in build quality to the 300E, I'd probably buy one. It has original transmission, same engine (top end rebuilt), suspension has been repaired/replaced but expected, no major electronics repairs (ECU, MAS, etc.). Average maintenance per year has been about $1,500, all DIY because this car is anything but intimidating to work on.
When people learn how many miles are on the odometer they can't believe it. ("how can peacefully drive out of town?") blah..
I can't speak for the 210's but I am sure happy with my 124 purchase.