The new generation of wireless security devices, including motion sensors, are not only effective, they are very easy to install and operate-literally "plug and play".
I had a break-in in my Tampa home recently (musta spooked the perps when I came home, because the two items taken were found on the ground outside). Ironically, I had my home "speced" for a system just a couple of weeks before by the husband of one of my employees, a guy who has become regarded locally as somewhat of a guru in the field of home/business alarms. At his suggestion, I found numerous on-line DIY technical sources, some quite cost-effective, for the new generation wireless alarms, including motion sensor-triggered wireless cameras that record onto a hard drive. A combination of wireless motion sensors and door/window/cameras trips can secure the perimeter zone as well as the interior effectively.
These devices are small, could be brought into the country very easily, and all that has to be done is install a batteries and stick them in strategic locations on the walls. No internal wiring. The master panel has to be installed near a phone line and power, if you want one that calls either a monitoring service or your cell phone.
My friend referred me to this website (he has no interest in it; it's where he, as a pro, bought stuff for his home):
Home Security Store - Wireless Security Systems for Home Protection . There is also an exceellent BBS/forum on this site where security geeks hang, offering detailed discussions.
Hope this helps.
BTW-I live in one of the better, more secure neighborhoods in Tampa. Goes to show no one is immune from folks wanting to do harm.