i'd go for alarm system first, then maybe surveillance

alarm system somewhat protect u when u in the house too - siren noise can deter the intruder - if u got cameras only no use when the intruder attack when u r at home

found this sometime ago googling in this forum
http://forum.lowyat.net/index.php?showtopic=867960&hl=CCTV

for alarm system google for bluguard or paradox