I feel ya. My system was stolen at school in the middle of the day a few months ago. But in my case, I had the faceplate off and I had an alarm, including a sticker that said I had it. But did that stop them? nope. Now, I had to disconnect the alarm when I installed my system, but it wouldn't have made a difference, cuz police said they were professionals. (and I knew they were too - just seeing the way they did the whole job.)

Sometimes nothing you can do will prevent stupid theives from stealing your stuff.