Hi Patrick, I went in January and had NO jetlag on the way out. I was amazed. I flew Sat 2pm, arriving Monday 7am (13 hrs ahead of UK when I was there but that in fact means 11hrs difference on the body clock)
I went with ANZ via LA. They were great in terms of food, space (an inch or two better than most) and staff. Going west also allows MUCH more luggage, including taking a bike for free. The only disadvantage of going that route is having to endure US immigration in LA.
A major part of no jetlag was the excitement of my cycling trip. I got a cab to my partner's uncle's house, unpacked, had brekkie, bike fettled, then cycled about 25km in and around Auckland. I am a big fan of exercise and sunshine (or bright daylight) in getting the body sorted.
I then had a 90 minute nap about 6pm (set the alarm!) then went to bed at 11 and up at 6. The bext day was the first cycling day and I never had any jet lag symptoms.
On the way back I don't recall massive problems.
I took and aisle seat and drank so much water that I was constantly off to the loo, and I am convinced that was a good move.
Full story here
www.crazyguyonabike.com/julian