As much as I'm all for bike security, you should also take into consideration your area of bike use/locking.

Those pricey Kryptonite NY locks are REALLY heavy. If you do hi-grade lock + heavy cable, and you're talking serious poundage, as well as lots of size. If you're in a hi-theft area, it's worth it, but if you're not, I guarantee you'll be incredibly frustrated when you have to ride your bike for a short errand, and have to lug around this enormous, bulky lock. I did this awhile and almost completely gave up on using my bike for its most effective tasks, which are short (<2 mile) commutes and errands since the lock usually outweighed anything I was carrying.

I've been perfectly happy with a standard kryptonite U-lock, particularly because it makes any parking meter a bike parking spot (fits perfectly around them.) I don't ride in a hi-crime area though, although it's still urban. Light enough to still not feel ridiculous when I ride a few blocks to run an errand and back.