There are many good CCTV items around, but prices vary considerably. Focus DIY, B+Q, Wickes, Argos etc do some fairly simple systems.
You don't really need colour, black and white is fine, but to be used in court they need to show time and date on the recording.
Your best bet is to fit dummy camera housings that act as a deterrent, but don't bother with sort with a flashing red light on because the real ones rarely have these !
(If your getting serious, install dummy cameras, then small covert cameras that record. then if the vandals attack the dummy cameras, you've got 'em).
Neihbourhood watch is sometimes helpful.
Make sure ALL incidents are reported to the police and they should use the statistics to up the patrols, (if any) in the area.
Never an easy one, but I hope this helps.