Couple other thoughts-
Trim: standard trim needs upgrading, satin silver looks cheap. Personally I think wood looks best with beige and would go for fineline. This is £345 upgrade on SE but again only £100 on M Sport (closes the gap even more!)
Power tailgate: I have this on the Q5 and always will again. No more dirty hands.
X3 30d M Sport Carbon Black delivered April 2012