What is the best alarm for my harley nightster?

Question

needs to have a perimeter alarm. im not so much worried about it being stolen (kept in garage). im worried that when the school year starts back up some jackass punk is gonna walk by and key the paint that i waited 2 weeks and had to look out of state for. (olive and black {flat}) so to make a long story short, something that chirps when you come near it, not only when you bump it. so far i have decided on a scorpio, but looking for more opinions. thanks much.

Answer 1

claymore with a proximity fuse, that'll teach em to key you!

Answer 2

Best protection I've ever seen was a rope with a German Shepard at the end of it.

Answer 3

80 pound Rotweiller.  Don't feed it.