I have a 96 W210 and it is a great car.
It is my first MB and have been for the most part I have been happy with it.
As someone mentioned, the differential seal leaked 3 different times but were covered by warranty and is fine now (almost 4 years now).

Many people have mentioned the head gasket leaks but to my knowledge, no one that actually has this car that I heard of had a leak. Mine is fine as well. Maybe they fixed the problem on this model.

My car is solid at all speeds including up to 125 but then I have European AMG E55 springs on them so I can't speak for the stock suspension.

I currently have 148,500+ miles on the Odo and planning on driving it till it dies. Hard for me to buy a newer model when my W210 has been fun to drive and still drives well.

I have seen ads for this model selling in the $10K - $12K range for cars with under 100,000 miles.

Best of luck.