There's one thing about your post that no one has addressed ..... and that is your intention to arm your system only when you are not home.
One question I always ask prospective clients when they suggest that is .... If you had to choose a time .... to arm your system and you could only choose one. Would you choose a time when you and your family were home or when no one was home? (Hint) When are the most valuable things that you have ....... there.? ie. Possessions can be replaced.
I'd suggest that you try to watch that new program on TV. "It takes a thief" Gives you somewhat of an idea of what it's like and how a burglary is accomplished.