Your in a delima that most guys ,including myself ,fall into after buying a cheap MB ,their mostly reliable but just like all things mechanical it all fails at once.You really need to make your decision after inspecting the cars your interested in through a shop , once youve done that will you know what your looking at.If you stay with the old 190e and expect another 5 years think again ,it will disappoint you .Sell it cheap then find a couple of service queens .You cant go wrong with a car thats got champion service hanging around its neck.