Hey Keith, thanks for the response! I have a 08 S2000 that rattles my brain with every bump, so I think I can do without the Sports Package (although the bigger rims/tires would look better; the 17" will be cheaper).
By the way, the G35's clutch is not easy to operate smoothly. I noticed that the 550i throws are longer than the G35 (and much longer than the S2K). What is your experience?