-Viper Responder 350 2 Way Alarm
-DEI 520t Back Up Battery
-DEI 507m Tilt Motion Sensor
-DEI 513t Mini Piezo Siren installed hidden
-Ebay Hood Pin
Bought all of the above for right around $200.
but honestly, and DEI product will do fine.
2-ways will help because they actually tell you what's going on instead of just make noise.
if the thieves unhook the positive cable for the battery, usually it all would lose power, but with the back up battery, nope. also, while they are in the process of even popping your hood, it will go off with the hood pin.
and the mini piezo siren is to keep blasting in their ears while trying to take your car.
and the tilt motion sensor is if they try to take your wheels or simply tow it away