This is what I'm getting. And it's been installed before on the Camaro by a couple on this site so I know it is compatible.
http://www.viper.com/P-3302V/Viper+5...ecurity+System
It's a 2 way alarm meaning that your car will page you if something is happening (better then a really loud alarm). Plus Viper has a secondary siren that is really loud
http://www.viper.com/P-515R/Backup-Battery-Siren