I hear ya Scott, the 03 Camry came with an alarm, but Leda went ahead and bought one of the best available, fortunately it detects any slight impact anywhere on the car, including windows, but it has been very good about not going off accidentally, unlike some of the el cheapos out there, it is very annoying indeed and intrudes on the rights of others to peace and quiet when they go off for the slightest thing or no reason at all.
Virginia's Honda Civic has dual alarms, so it is pretty squared away, disables ignition system and everything.