I'm thinking about having these guys enhance the alarm:
http://www.sound-in-motion.com/installs/light_theft.html
HID theft is rampant in Boston area, particularly Cambridge. Just yesterday I saw an RX 330 that was parked a block away from my house missing its headlights.
I also never park on the street and when my car is in my driveway I pull right up to the fence.
Hopefully, Lexus will offer an anti-theft package like Nissan.