Garry,
If you like the car, go for it
I have a friend who recently bought a 1992 model with the V12 engine BTW, this is still a SL500 and not 500SL. He absolutely enjoys the experience and loves it as a daily driver.
His words are that this is the best you can get as the car is based on the well-proven mechanics from the ubiquitous W124 while the undercarriage is partially from nonetheless popular 190 model.
The only investment he made was to replace the softop with the HT and as for him the looks of the car with the HT is even more terrific…
I think we are just in the last moment when R129’s prices are in the low, but I am certain that we will see it on the rise very soon.
To me R129 is already a classic and very charismatic as well as stylish, but not a vintage car… yet
So, in other words, if you can afford it, go for her…