very clean M3!
I was in the same boat a few months ago and my wife ended up selling her IR M3 for an X5 diesel, which is also a blast to drive! I've test driven the X6M and you dont even feel the turbo lag or speed, it defies physics on all levels! If you want to save some fuel, the X5 35d is giving us 19/28, not too shabby and the 425 ft-lb of torque brings a nice grin as well.
Best of luck with the sale and update us on your next ride!
clear bra, ceramic tint 60F/50R, bel rx65, pss9, dixis, le-37, wheel stud conversion, yellow belts