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Well, seeing as I just bought a new alarm last weekend (after they got the stereo), I'll share what I learned. There are basically three alarm companies, Alpine, Audiovox, and DEI. Alpine I know nothing about, except that it is always about $60-100 more. Audiovox makes the Prestige line which has all your basic features. DEI is the maker of the Rattler, Viper, Avital, and Clifford. IIRC, that is their "order of prestige." As you get to a higher brand, it has more/better features and higher price. I've heard that Clifford isn't as reliable, but offers the most gimmicks. The basics are dual shock sensor, siren, flash lights, etc. Extras include door locks, pins for the hood and trunk, remote start (AT only), trunk release, window roll up, interior light turn on, etc. Expect to pay $250 installed for a base, up to about $450 for all the gimmicks. I chose a DEI model and got most of the add ons.
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