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I used Moving Audio after he'd been recommended by another Model S owner. $3,060 installed for system you've stated.
Done while you wait but he's popular so it's better to make an appointment for the first job of the day. Park on the main street that runs perpendicular to his and if you get squeamish, do not watch the installation! He has the Tesla trim clips if any happen to snap during trim removal.
Just FYI, you don't need the Power Magic Battery Pack in a Tesla. It's doesn't hurt to have it, but it's redundant with the 12v accessory battery that automatically recharges from the main battery pack as-needed.