I have an E Class with OEM 17x7.5 rims. I am looking for the quietest and smoothest riding 235/45/17 tire. Can you tell me what to get? Would they be the Continental Conti Sport 2 that MBZ puts on the cars or do you know of something with a better ride? I am not really concerned with handling as I only have an E320 and have stock suspension--not much of a race car. I have Phantom ZRX tires on there right now and they are horrible--loud and rough. How much better is a Continental or whatever you recommend? Thanks for any input!