I'd go with a Viper alarm.
www.directed.com I believe. Also if I'm not mistaken, all of the alarms that have pagers also come with remote start. Someone correct me if I'm wrong. So basically, get a two way Viper, it covers all the sensors (lights, trunk, hood, door, someone bumping your car, etc.) and then get a proximity add-on for the warning beeps when someone get's too close but not actually touching. Then, get their batter backup siren. It keeps going off if the batter is cut and then can only be turned off with the supplied key. For added protection, I sugest a pain siren or two (about $4 on ebay). Put them inside the car and the theif won't be able to sit there for much longer than 10 seconds. I have the Viper 791xv with battery backup and pain sirens....a million times better than relying on your blood sucking insurance company to help you out when you get broken into two nights in a row!