I see that no one has replied, so let me suggest that you go to Tirerack.com and look around. You can input your car's make and model and they will recommend various tires and wheels. I think the most common wheel size for 215/45-17 tires is 17x7. Good luck!
I don't own one, but I recall Road & Track recommending the Mercedes-sourced automatic, as it was in keeping with the sporting nature of the car, and clutch replacements for the 5-speed are legendarily expensive.