I'm sorry to hear about your bike.
I live in a city with one of the highest bike theft rates in the country last I heard a statistic, so I think about the security of mine and others bicycles alot. I have had an alarm on my bike for a while, but its mostly just for show, makes alot of noise but can be cut off with bolt cutters easily a
nd also this sticker that uses thoses coded pictures smart phones use and is registered online(I will list the links below).
However I just found this which I am going to order, its a U-lock, and/or cable lock with a built in alarm. It seems to be a great option and im hoping it will be as good as what I would hope to recieve from a professional security company. Also I think bicycle security is a large enough topic to have its own categor, but since it doesnt i will start a thread in the bicycle safety forum. Hopefully everybody will put in there 2 cents and we will begin a large resource of security options.
Bicycle Security & Theft Prevention Product
Bike Shepherd - Bike Registration and Stolen Bike Alert
Motor bike Bicycle Alarm Security Sound Alarm Lock | eBay