+1 for the Scorpio System..... If you get it thru http://www.kneedraggers.com then you get a free factory connector kit which makes it easier to install. You will however have to splice the ignition wire for the Ignition Kill feature. I did it right below the fuse box, nice and neat. I think I have a few pix from the install I could post if you want to see the process.
Smart thinking,along with the alarm system I use a 15ft cable lock and lock my bike to a nearby telephone pole when I'm gone for any duration of time.
At night it's safe in the garage,at work it's armed and locked to the pole.
The good thief will steal it regardless what you have on it.And it'll take all of 10 seconds.
A lock might slow them down until they can get the bolt cutters brought over.
All thieves should be SHOT!