Alpine quit making alarms (for the second time) in 2002. You do not want one.
Alarms have MANY DIFFERENT FEATURES from brand to brand and model to model. People who think they are all the same are not informed on the subject.
I like the Clifford G5 line of alarms and Autopage 850 for LCD 2 way product. Some of the Clifford G5 alarms have digital sensors that are adjusted from the remote and offer independent warning and trigger adjustment and they offer SAFE remote start for manual transmissions, anti-carjack, remote shunting of sensors, coded override switches, laptop programming, and many other features.