Hard wired sensors and cellular transmitter all with back up batteries
Ok, I'm out of contract by now but I'll admit I have an ADT system. My two story house was built 11 years ago and (not a custom house but they give you a few options) I picked the option for an alarm prewire. Every door and window (even on 2nd floor) have hardwired magnetic sensors in the frames. All those wires go to a box in an upstairs closet. The prewired for 3 control pads... One by the front door, one by the door out to the garage and one in the upstairs master bedroom. The painfully loud siren is hidden in an air duct. The monitor system works over cellular (a more recent free upgrade without a new contract) so cutting (or not having) a landline isn't an issue. Separate batteries back up the alarm and cellular modem.
I don't think I'd consider a system that didn't integrate with my hard wired, no power source required, and non visible door and window sensors.