The recently released VeraSecure combines a home automation hub and a traditional alarm system with battery and cellular back into one unit. They seem to offer monitoring plans too. I haven’t seen any reviews on it so no idea how it is but at least Vera runs everything locally.
This thing apparently includes a 345MHz 2GIG radio so it can also support many sensors for people with existing alarm systems based on 2GIG hardware such as Alarm.com
http://forum.micasaverde.com/index.php/topic,49096.msg322430.html#msg322430