The Edition 125 car had a few items on it that were otherwise extras, so don't fixate on the Edition 125 as it's not that difficult to find a car that someone put the options on. Standard wheels on the E-Class Sport are 18's and its easy enough to swap them if you really must have 19's, but ride quality will suffer a bit. If you want the best ride go for an Avantgarde with 17-inch wheels, or otherwise search for a Sport with Airmatic, or one with the optional "Comfort" suspension (they are about - member Reflexboy recently bought one).
I really don't get the BMW M Sport / runflats thing. The ride quality is absolutely terrible in what should be a luxury exec car.