From you other posts over the last 6 - 12 months I assume you have several RTW's on the go at once and several of these over the next few years.

Have you considered starting a DONE4 in BKK? Much cheaper than starting in USA or NZ. AKL-BKK is not that expensive. Starting in BKK gives you the advantage of 6 stop overs in USA (as against 2 if you start a DONE4 in USA). You could easily have 2 or more DONE4's on the go at the same time (both the direction or one clockwise and the other counterclockwise)