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I like the TiGr Blue locks. They weigh 15/17oz depending on the version and are fairly secure. Don't get the titanium version. People think titanium is stronger than it actually is, the hardened steel version is harder to cut. They're not as secure as some 4lb Kyrptonite, but who wants to carry that around?
I'm looking into getting one of those dinky deadman switch cable locks as a secondary. Basically they have a remote you carry with you and when someone cuts the very thin cable, it alerts you so you can run out and beat the nigger.