This list actually finished clearing up my confusion.. I guess I had tried to get too much info in too little time. I kept insisting to myself that I had read somewhere that the 93 W124 had the M103 motor, when in fact it has the M104.

So, now if I want the less electronics, no faulty engine harness, no leaking head gaskets..... I will just look for a 91-92 W124 with an M103 motor......

Thanks