Most towns have an alarm company that is affiliated with one of the larger alarm companies. Talk to them. No one can tell you what to get without seeing the house and layout. You can get hooked up to them pretty reasonably for a 24-7 auto callup. Even get lease or pay to own deals with most of them.
Just make sure that you put your phone lines in to a piece of armored conduit so they can't cut your lines.
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