I've used all levels of Audiovox (Prestige) alarms in the past. Ranging from a $45 all-in-one unit w/ a built-in shock sensor and featured a total of three wires...a ground, a hot wire that jacked into your dome light fuse for current sensing, and a third wire that worked the LED up to my current alarm (I forget the model #) with remote start, mercury tilt switches for the trunk and hood, secondary backup, etc, etc, etc.....suffice it to say it's full-featured. I have no direct experience with DEI or Viper alarms so I can't comment on them per se....but I've never had BAD luck with the Audiovox stuff and would recommend it to NE1.