well, i just went to another place today and he does a clifford system for 400 installed. he claims to only have lost one car in 17 years of alarm installing by actual alarm disabling(not towing). Ive heard good things about him too, and he said the audiovox can be disabled quicker than the clifford, and that he sets it up so if you open the car with the key and no remote(i.e. you lost the remote), its set up to "stop the car from cranking" after 5 seconds, alarm ringing from when you open the door.
i dont know they both seem trustworthy, and they both would do my system also. audiovox for 300, clifford for 4?
(both the 2 way systems)