J.W.
I would go local but I am partial to local security systems since my cousins own a security company.
The thing is those that charge little upfront put in crappy equipment and then turn around and charge two to three times as much for the monitoring as the companies that charge the equipment cost upfront. So you pay 100 for the equipment and an extra 50 a month paying for the free equipment.
What I am saying is don't just look at the install costs, also look at monitoring costs and figure out what you are actually paying for.