personally i would go for viper. thats one of the best sellers. U can add may options to it, like ignition kill, remote start so many options. look around and asked questions before and especially go where they know how to do good work
i just bought an Avital alarm man, its under the same company as viper, clifford ect ect, DEI owns all of em. you can get pretty much the same addons as the viper, like i got a proximity sensor added to mine