i have heard about the gps alarms go for 750-850 w/out installation.

the GPS helps much more than other alarms especially if the thief is an expert or has a tow truck.

supposedly if a car with GPS leaves a certain radius of where it was initially alarmed a call will be put into your cell phone...etc

get a good instalation, relocate the brain, add some kill switches, use the GPS technology and you have one difficult car to steal.