Often burglaries are committed by local kids looking for thrills and spending cash.
TAB's backhoe caper was obviously a more dedicated crew.
Also, if they broke in once, they are very likely to return. I'd be expecting a return engagement by that guy next door, ellis4538.
You might want to consider hidden video cameras inside. Might not stop them, but could help identify them and convict them.
External cameras might be a deterrent but if they can be spotted they can be defeated by wearing a hood and then destroyed.
The GE Simon security system is one you might consider. It is reasonably prices and is user installable. It used your home wiring for it's connections and communication. Along with the monitors and sensors, a few loud sirens will go a long way to discouraging someone from hanging around. Place a siren or two where they broadcast outside, maybe in the peak vents of the attic if they can be powered up there.
Here is a link to a site that gives some discussion about the features of the Simon system. Do a google search on ge simon to look for the best prices and to locate different components.
http://www.protectamerica.com/pa/ge_simon_xt/ge-simon-xt If your power shutoff is outside or if your power can be easily shut off from outside, you might want to consider alarms that will sound on battery power if the main is disconnected.