That year 104 motor had problems with the engine wiring harness. That was in the first years of the electronic fuel control and they had problems with the harness insulation just falling off the wires; not a good thing.
Other than that and the head gasket problems that is in the last years of that body sytle (124) and as a result has the best most proven systems. It should make a great car. About the price I really don't know I don't follow sales much.
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician