Hardened security chain is much better than any Cable Lock bolt cutters cut regular chain and cables easily.

Abus Locks , such as this is better ... http://www.abus.com/eng/Mobile-Secur...ation/1500-Web.

available through Bike Shops , here they get them through J&B import-distributor.

there is the possibility to strip parts so make the front wheel, for example, harder to remove..
a non quick release axle fixing system ..