System wise, I don't want to commit to a particular system/vendor yet, and I want flexibility of choosing from different provider later. I assume that all the wires are compatible amongst the many different systems (ie, the three wires for power, ground, and signal, same gauge requirements, etc)? If not, what should I look for?
What can I expect to pay for this? How do I spot a good installer? What questions do I ask? How many sensors should I install (I am thinking all the doors, all the windows, fire, water, smoke, low O2 (is there such thing), what else am I missing?)?