I would try the Woodcliff Lake, it has a warmer tone than the lighter greys.

I don't know how hot it gets in Auckland in summer (I've only ever been to NZ in winter!) but if it gets hot, then go for a pale colour. Dark roofs should be kept for cold places!

Do you have any photos of the front of the house that may give us a better view of the green trim? Have to say that painting costs so much and lasts just so long, you may want to wait until it's needed.

Definite improvement over the purple! Don't know what it's like elsewhere, but this colour scheme is very popular in our area. A shame really, it's getting a tad "over-used" and leans a bit to the monotonous/depressing side when there's too much of it. A few houses, fine - too many, not so good.