Unless there has been a sigificant change with 2011 vehicles the Sport Package is appearance only. There is no "sport suspension" other than the adaptive drive.
The self-leveling suspension uses inflatable airbags to raise the rear ride height (back to standard) when a significant load is carried (or a trailer is attached). I don't believe it does anything other than this.
Bottom line I would not be concerned with having both Adaptive Drive and the self-leveling suspension. BMW designed them to work together.