Use two locks, because that way your bike is twice as hard to steal as everyone else's.
NO cables, not at all, from any brand, ever. None. Waste of money.
I say U-lock + a chain lock. And use real security chain
, not the stuff they cut-to-length for you at the hardware store. (hint-hint)
Get GOOD brands. EXPENSIVE brands. Kryptonite or Abus. Get the top-end models, not the cheap ones. The cheap ones are crap. Kryptonite sells u-locks for $25 now, and they sell u-locks for $75. Guess which one is the GOOD one?
Yea they cost money. So does a new bike, plus the inconvenience of having it happen.