Thank you. I did some more research and am going with the Omega Security System. I'm going to do the alarm and paging system. I don't need the start up feature. They said that the Omega System would page me within 2 seconds after a break in, as opposed to the Viper System which would page me 10 seconds after a break in. They said it's compatible with the oem, but it depends on how good the installer is. They said that the alarm sends a negative signal to unlock and disable the factory alarm each time. When you arm the car, it sends a positive signal to arm both the factory and the Omega alarm. This way, I would be armed with 2 alarms. I have an appointment tomorrow to install it, so I will let you know how it goes and if it's worth it.