I live in a small university town where bike theft is a cottage industry and tweakers abound. My main ride is a converted vintage mtb. that I put a fairly substantial amount of money into, and that I think is the schizzle and very desirable, but not sure the pro thieves would agree. I carry a cable lock because of the weight and because I don't really park it for that long, and to keep honest people honest. I also park it with the understanding that if a real thief wants it, they will get it, no matter what I lock it with.