I want to get a new alarm for my GSR and am looking for recomendations. Besides the alarm I want a hood lock, battery backup and air horns. The alarm a local shop recommended was the Viper 300 ESP. I have heard great things about Viper but after checking out DEI's website I noticed that this was the base in the viper lineup. Should I look into the 500, 600, & 800 ESP as well, and if so are they worth it? Also if not Viper whom else should I go with?

Thanks