IP camera plus wireless alarm system with GSM, that’s my recommendation.
Now you can find this kind of system from this webpage:
http://www.hkvstar.com/item/g60.html
Working theory, using your smartphone to monitor your property real time. When alarm is triggered, you will get notified with phone call, also text message (SMS), you will receive the snapshots from IP camera to verify alarm.
Btw, the system requires a SIM card to run.