I'd personally avoid a combination style lock.
I had an Abus one just to lock the bikes together when on holiday and mine totally jammed up on our recent trip, meaning 5 bikes were locked in a way that I couldn't get them back into my MH in France on a camp site
We managed to get hold of a set of good bolt croppers after a long winded explanation to the French site owners, and that just squashed the cable, but wouldn't cut through it. Great strong lock for little money I thought, until I actually managed to prise it apart using just a screwdriver.
I need a minimum 2 metre cable lock because we always have 4, and often 5 bikes to lock up at night, or when out and about, so I will watch this thread with interest.