Alarms, Locks, Tracking

I have been looking around for a good lock and I'm also looking for a good alarm or maybe just a tracking device. Anyone have any luck with any of these? I was looking at the Scorpio for an alarm and a chain/padlock type setup for a lock. I live in SF and bikes get ripped off here all the time. The only way I can get full coverage is if I park the bike in a garage! I have to look at some more insurance companies and see if they offer anything better. Any info a plus. 
