Don't forget to check load ratings. I think a 205/40-17 or 215/40-17 may not have a sufficient load rating for the car.
Do a search about tire sizes over the last three months. I know I was part of a discussion about this in the recent past, and think (but am not sure) that some extremely low profile tire combos don't safely support the weight of the car.
OBTW, I have 215/45-17's on OZ Superleggera's, no drop for my car....yet.
FWIW,
TB
