to wire the entire house with 15 motion sensors, 2 motion detectors(for roof), 2 keypads, processor board, siren with flash strobe, internal alarm, it will cost you from RM2k onwards.

Supa8, DF, are some of made in malaysia brands. Paradox is made in canada.

Prices can differs greatly with different installers, but almost all of them said they provide better service/after sales service and all sorts of standard pitch la.

Good luck.

And oh, by the way, the wireless sensors are operated with factory installed battery. i.e. you have to call the installer to install new batteries once it run out. Also, is hard to tell whether the sensor is working or not.