i had mongoose it was dogs balls, paid so much for it and didnt come with central locking and every time u turned the key in the barrel to just electrical the alarm went off even b4 i started the car paid abt 300 they said it came with central locking and half way during the installation they said it didnt omg.
shitted me nuts
try black widow good price and central locking inc not sure abt the quality ($200-350)
or if u wanna go top range go viper (+$400)
quicktrack is another good brand i trust. its like 400 for the unit and gprs is like 360 per year.
i suggest an alarm for any case. gives u the security u want from teenage n00bs using a fork and screw driver to steal your car.