Yes I too have a e280cdi sport and yes the tyre sizes quoted are correct, I have just fitted a set of avons ZZ3 to my rears and look awesome 105 a corner
I have the same tyre size on my sport, and I just fitted some continental contact sport 5, I think they were about £150 a corner, for the front, but still got a few miles left on the back which are continental sport 3s but think I will have contact sport 5, but my friend sweats by the Michelin, where Costco have some great offers time to time.