GPS Car Alarm Options??

[CJ1177]

Has any one had any thing to do with either the ezitrak or car minder systems or know of any one who has, alternatively do you know of a better brand that does the same thing.
the main differences between them is ezitrak is a complete alarm & tracker in one unit were as the car minder is just the tracker that you add onto an existing alarm

features wise for tracking there is little difference,
both only ongoing fees are the Sim card
both send you the location of the car via SMS giving you;
GPS coordinates
one gives UBD map as well
both give heading/ direction
both use voice as preference to SMS as it arrives quicker than SMS
time entry point etc etc
both can open doors remotely shut the car down sound the horn & lights

there are plenty of alarms that have the SMS pager but all they tell you is the alarm has gone off.
i want to help the police to catch the Little **** in the act

Chris