That's a good combo, I've one like that from Axa. It defends against both kind of thieves, the ones who break the lock on the spot, and the ones who take the bike locked and break the lock later by putting the cable around a pole or something and insert it into the O-lock.

The clever thing about it is that you can leave the chain at home for trips to safe parking spots, or leave the chain wrapped around the frame of the bike if just the O-lock will do in that spot. The chain itself can't be stolen if it's inserted in the O-lock. I have it wrapped around my brooks saddle so that can't get taken off either.

I'm afraid the best theft prevention is to have someone else's bike stolen, locks don't prevent bike theft in general, you just have to make yours the less attractive to steel. These integrated Abus and Axa's are a lot of work to break and the cable has to be broken on the spot, and then the thief still has to carry the bike home, put it in a van or break the O-lock on the spot too, and that will take quite a tool. A noisy angle grinder for example. That increases the chance of getting caught. You could also get the lighter insertable cable and use the one that is fitting for the risk of the parking spot that time, but to me Vancouver seems flat enought not to worry about weight at all.