i got the same car 2012 MSport, Carbon Black, Black Leather, Nappa Dash w Contrast Stitching and Bang and Olefson.
I like the carbon black, no regrets. its not that hard to care for, keep swirl free if you know what you are doing. I bought off the lot. I would have considered ordering the car in silver for less swirl problems.
I love the B&O stereo. It is my favorite thing about the car. It didnt impress me at the dealer but I am glad I have it. After you live with it a few days and listen to a variety of music you will see how good it is.
If I had to do it again, I would avoid the Nappa Dash. It is just too delicate of a material to cover a dashboard in. The standard dash is much easier to care for.
I like my black interior because it doesnt show dirt. I can also wear my raw selvage jeans without worrying about blue rubbing off on the leather. I kind of like brown leather and red leather though. If they had one on the lot I would have considered it.
I also regret not getting black piano trim.