New Red SE5 Spyder rider here (2 weeks in) and have been loving every minute of it. As for security, I picked up the Scorpio SR-I900 with the Can-Am Spyder Factory plug-in kit this week and couldn't be happier, all for under $400. The perimeter sensor is a nice option because it alerts anyone via chirps once they come within 5-10 feet or so and goes into full alarm if they don't back off (this can be disabled via remote when needed). Whenever the alarm goes off (shock, tilt, ignition, or permiter sensor trigger) the included pager keychain alerts you via sound, vibration, and a timestamp so you can go hollar at anyone messing with your :spyder2: and know exactly what time what sensor was triggered. There is also an ignition kill option which gives one the ability to disable the bike remotely if one was held-up by gunpoint. VERY SWEET. In addition, this specific alarm has RFID technology so the alarm knows when you are within 5-10 feet of the Spyder and enables/disables automagically. No need to hit any buttons anymore which I love because digging a remote out of my pocket everytime I needed to ride would get old.
I was able to install the whole system (minus ignition kill), with perimeter sensor, in under 1 hour with only the Torx head screwdriver as my tool. All that is involved is removing the rear splash guard (with the Torx), unplugging the rear blinkers and taillight, and plugging those into the factory plug-in kit and then connecting the positive wire to the battery. Still have to hook up the ignition kill as that requires cutting one of the primary electrical wires (fuel pump, injection, or kill switch) as I wanted to make sure I picked the right wire first. Red wire or the blue wire...:yikes:
http://www.scorpioalarms.com/products/motorcycle/sr-i900/
Cheaper prices are out there, you just gotta look for them.