Just my teppence worth: If I had a nice and/or expensive bike, I wouldn't commute on it if in a high crime area or I knew it would be out of site. My old commuter was £1500 new, but the area is low crime and there is cctv on site, plus offices overlooking the bike stands. So I was happy using a Kryptonite D-lock (think it was £70-£80 at the time).
If you really want to ride your nice bike to work and lock it up, I would say if you can afford hundreds on a bike then you can afford the litelok X1 or X3, for me that would be a no brainer. A bit like buying a motorcycle and then spending a few hundred on helmet, gloves, boots, locks etc. It's got to be done.
I've just watched the angle grinder attack on the X1 and that seems really impressive. At the point where someone is going to go through multiple discs and risk having the police called on them, I think that's the best you can do (and insure it)