I don't like security system signs. I would rather have a system, with an Un-Godly number of exterior sirens, and let someone find out AFTER they kick the door in that I have an alarm.
Basically my thought is "they don't know I have a firearm until about .5 seconds before I use it".
This scares the hell out of me! Most of us here (I hope) keep firearms in our homes praying (or hoping if praying isn't your thing) that we will never have to use them. You, on the other hand, sound like the kind of person that can't wait to use them.