Not convinced by the whole 17" wheels thing. The performance stats on various sites seem to imply that 16" will actually perform better on most roads, and 17" is only worthwhile on track days.

The weight of the 17" wheels seems to more than offset the improved cornering in most everyday situations

This is purely from reading I have done on the subject - I have no first hand experience. I only have 15" - sob. (Heh, what a line - sorry)