Regarding the cable locks, people keep saying that, yes, it is easy to be cut, and you should not use it as the main lock for your bike, but should use it as a secondary lock, just to lock your front wheel to the frame. It sounds poor logic: if it's easy to be cut, what's the use to lock your wheel with it?? The thief will get your wheel, which you don't want to lose.
Few thieves would go to the trouble to cut a cable to steal just the wheel - if they can cut a cable and get the whole bike it's worth the hassle.
My experience with cutting cables is that it's harder than just a snip with the bolt cutters - you end up more or less chewing through the cable, which takes a minute or two. I've never tried to cut a bike cable lock, though (what I've cut has been industrial wire rope), so I don't know how different it is. I suspect it's similar, in which case it's enough effort that it's not going to be worth it to a thief unless your front wheel is something really special.
For large wire ropes we used to use a carbon arc slice torch, which would make short work of any sort of lock - but the thief will have to have a truck-mounted welder and a decent-sized air compressor to run a tool like that.
