I've got a DSC power864 system in my house. mixture of wired, wireless, addressable, security and fire. supports audio listen-in and verification and supports Escort, which allows for home automation via x-10 support. turn on and off lights and thermostats and stuff. no complaints.
going on two years, and I've yet to have a single battery fault out of any of the wireless stuff. coverage area is good with the wireless. 2300sqft house with a full basement and I've got one wireless receiver that covers the entire house.
no complaints at all with my system.
I've also added a 120db horn/horn driver. when my system goes off, EVERYBODY knows. whatever you get, make sure its LOUD. the more attention you draw to the fact your alarm is going off, the better.
actually the cheapest and best bang for the buck you can get is a Yard sign from a security company and a couple window stickers. LOL. this'll drive off 90percent of the burgs.