Chaps,
Sorry to hear your shop was broken into, not good.
I don't fit alarms for a living, but have been privvy to some pretty damned good alarm installs on some pretty impressive property.
I've not heard a lot about Chubb, but haven't heard a lot positive either.
Have a look at the Honeywell Galaxy alarms, bosch blue (i think) sensors and a klaxon signals Inferno sounder, a few of them going off would wake the dead, never mind get the intruders to leave.
Oh – and some decent CCTV.
Sorry to mention this post event, but, well, I am.