767 is standard 2-3-2 seating. If you are travelling with someone then I would go on the outside 2 seats. If on your own I would go for the inside aisle seats and at checkin as for the middle seat to be blocked adn that will give you a bit more room.
Pitch is at 34" which is not too bad with deats with wings and footrests.
Also 767 has three cabins, J and then two sets of Y. I would go for the first Y cabin.
NZ recognises *G and if operational requirements dictate will upgrade you along with other *G's. Also based on the pursor you may also receive a free paper and some other goodies along the way. But loadings are down from the heights at the middle of this year so I would not count on it.
You can find the seat map at
www.airnz.co.nz I would avoid row 8 as the FAs cannot see the call light.
Bulkhead seats give you no extra advantage except for the increased possibility of having a baby next to you.
And you will enjoy the lounge access particularly in the new lounge in SYD.
Hope that helps?
mark