Was talking to a mate of my dads the other day at home he has a similar system to this
https://www.googleadservices.com/pagead ... INg&adurl=
But with more pir sensors as he parks his van fairly close to the house as most of us do I suppose, he has put a spare sensor in the back of the van so if anyone gets into the rear the house alarm goes works perfectly and doesn't bother the alarm when he drives off to work.
Another more expensive option again I don't know the brand, but the same fella has a cobra kit car and is going to be fitting an alarm that texts to his phone if the car moves over a few ft when it's not supposed to be doing so and gives him the ability to kill the fuel pump on command via an app on his phone..
Both decent options I think..