Terry,
I went with a local company called California Safety. They do nearly all of the banks and large businesses around here and have excellent service. In fact I am having them come out today to check my back up batteries. It sounds as if you already have a great start. A lot of people seem to forget about the roll up doors in the garages for some reason. I made sure that mine was done and then I disabled that sensor and tested the motion detectors and infra red detectors in the garage by going down my driveway to see if they would set off the alarms. I could get to within about 20 feet of the door before one of them would trip. Sure drove the dopers across the street nuts when I was testing as they are afraid to come out of the house for fear a cop may come by. As for the snip of the telephone wires in most cases that would be right, but remember I worked for Bell, Labs. I have back up wires that go in the wall and then underground to the main splice box on the poles. Also I have two lines, one dedicated to DSL which I can use with a regular phone if I need to. Darn city made me take the land mines out and they were just small ones.
Ron
Ron