viper is the way to go, next step down would be the mongoose imo, if you're not in a rush to buy an alarm get a viper on ebay, brand new viper alarms from the US cheap as chips compared to the prices over here, python is the same as viper both made from the same company just different names

confirm with the seller that it they have sent it over to australia with no problems because a few years ago viper stopped everyone else from importing it in from overseas cause they were losing money from it lol