So I'm looking to cross the Pacific, and am weighing CO(Mike), NZ and UA, but I cannot find any info on what *G will get you with NZ. Anyone have better info?

Has anyone sampled all 3 carriers? I can do CO IAH-GUM-CNS for about $2500 M-fare plus 50k miles to get BF IAH-GUM, but then I have to get from Cairns to Sydney & Melbourne. Or, I can do NZ econ+ for $2100 LAX-AKL-SYD. UA is asking $3k for 744 econ.

Thoughts?