If you grant access to an intruder by omitting the basement/cellar areas,then the intruder will assume all other areas are not supervised too.
Basic criminal train of thought.
Secure all entry areas and put up lots of warning signs,maybe a couple of dummy CCTV cameras in key areas with CCTV in operation signage.The real thing (remote viewing) if you still have broadband.
The pyronix deltabell with backlights are another visual deterrent but it's not really one for the average DIYer,but a decent sounder all the same.
What control panel you using and is it running two sounder's at present?.
e manno, October 2013