Doh!! Dude that sucks..and I feel for you... A couple years ago, I used to own a 86 Gta Trans-Am... was nice.. had a decent head unit in it.. and amps. (in rear).. Well.. No kidding.. but that day, wife and I were driving around.. and stopped at wal-mart... bought armageddon the sound track. Well we had it in the player... and decided to go see the movie itself, which was playing at the local theater. We parked in the Lighted parking lot..and went in at around 9:35pm showing.. and around midnight...exited the theater.... while my wife and I were walking to the car... (only a small handfull left in the lot)... I noticed and (felt) something was wrong.. I could see what looked to be glass from a distance (almost as soon as we walked out of the theater)... and omg..the sinking feeling I had, I remember it well.. sure enough.. we get to within a few feet of the car.. and the passenger door glass was all OVER the place inside and outside, and on the ground.... the Head Unit was LITERALLY ripped out.. and the red AMP wire must have been cut by the broken glass, because it was lying on the passenger seat, and proceeding into the aft of the car. (They never took my Amps or Subs though)... so needless to say.. My insurance company wanted to charge me 500 deductible... for a $40.00 window.. and a Head Unit I could prob replace for 200... and to top it all off, they got our NEW CD too of the movie we just watched! ARGH!! I was pissed.. SO yea.. needless to say..I feel your pain.. and all this was in MAINE!.. (Supposedly the safest place). I ended up doing the same as you.. bought an alarm, and installed it.. and (REPLACING A POWER window on that year was a PITA!)... but I hope I don't go through that anytime again soon...
Best of luck... (btw, the cops told me it was probably a college initiation!! wtf! No chance of recovery...