Fielder,
You have just learnt a lesson (that many of us have, myself included) with the bonus of not loosing any of your kit or your whole car.
Rule one of car modifying is fit a good alarm with perimeter protection before you spend any money on anything else - otherwise its all at risk.
You've had a door damaged, and thats cost you a little money and caused you some agro, but take it from someone that lost thousands in stereo gear, you have got off lightly.
Fit the alarm NOW, and don't spend any more money on another area of the car until this is done - its clear they want in your car, so make it tough on them.
I wish I had been given the same opportunity to learn the lesson before all my Alpine stereo gear went walkies.
