Aero packages are standard on ALL current 06MY X3s. With the sport edition, the only difference in the body style is the flared arches (i.e. Aero I). All other current X3s are equipped with the Aero II package. So, IMO, the decision to be made shouldn't be based on the presence or presumed absence of the Aero package. The wheels (18" vs. 17"), suspension, etc. are different if one compares the sport package to the "standard" X3. The Aero packages are listed separately on the BMWUSA website to facilitate ordering by people with earlier models ('04 & '05 MY). To verify this, you may want to have a discussion with your dealer.