Congrats on your new M3. Mine is due in a couple of weeks. It is on the water now.
My impressions of test driving the M3 match with what you say about yours. I thought the ride was very nice but still sporty. I like the interior. The hood bulge looks huge from inside the car. Very well mannered for everyday driving.
Some questions. I thought the alarm came with the car. What are you getting? Were did you get color corrected halos and cornering lamps?