Need bike lock and locking tips.

I lock up my bike all over the city. And I want a quick way to secure it. The bike isn't expensive or specially attractive. But I want to deter casual thieves whilst having a convenient solution. Currently I have a 1.8m, non coily cable type lock that can go round trees and through frame and wheels. I've been considering a chain type, but that is harder to poke through spokes. And finding one long enough is not easy. Carrying it when riding should be easy too. Any tips appreciated.