$6700 for 96 C36 purchased 5/2010 with 134K miles, mismatched tires, sitting on H+R Springs and blown factory AMG shocks.
Of course, in my haste I didn't notice the paint crazing on the hood and fenders, or the struts knocking after driving for an hour or so, or the slightly erratic idle due to failing MAF.
I had experience with one other C36 which started and behaved the same way so I figured it was normal.
Luckily I had several things going for me:
1)- I have friends who do paint and body- so cheep to fix.
2)- I can DIY
3)-I have no qualms spending $$$ to restore.
So, a new paintjob + bodywork, new struts, new stereo, matching tires, new 02 Sensor, new OVP relay, tranny + radiator flush, CPS sensor, MAF, plugs, thermostat, cleaning up and redoing the PO's work (he thought he was a DIY guy like he saw on TV- complete bonehead) and filters I have a fully maintained car.
With the exception of non functional heated seats and a slightly weeping rear main the car essentially looks and drives like new.
I obviously have more $$$ into it than the car is worth but finding one in the condition my car is in not really easy being 15 years old. Not a ding, not even a nick on the wheels.

rjp