Second thoughts about getting IS300...

Geez reading all these messages about the cars who get vandalized is making me pretty nervous to get mine. Especially since I'll be living in an apartment where anybody could see my car. I know that incidents are most likely random and could happen no matter what car I drive, but I've been driving a bland honda civic for the past 5 years, a car like the IS is bound to draw extra attention.

I'm interested in finding a shock sensor that'll work with the factory key. I tried to do a search but it seems everything that has the word alarm in it is about remote start which I don't want, just want a shock sensor. Any clues?