I would opt for the 300E. I had a 190E with a 2.0 ltr, 4 cylinder petrol engine and althought it was a fine car, the engine was just not up to it. I recently bought a 300 CE, 124 chassis with the M103 engine and although it has 200.000 kms on the block, a service every 10000 kms with regular oil and filter changes has kept it in fine fettle. It drives and sounds just like a new car. Go for the 6 cylinder if you have the chance. I think anyway !