Do a search for Harmon Kardon on this forum. There is a EQ tuning set-up that is highly recommended and will change up the sound dramatically. There is a debate whether turning the L7 processor off will help as well. Also, if you decide you want more sound, the M Performance exhaust will add a little more rumble to your acceleration moments but is pretty close to stock during idle and while cruising.
The consensus on the board has been pretty much 100% to get the PDC and rear camera if possible and that once you go HUD you will never go back. They are both amazing.
Congrats on the new car. Welcome aboard!!!