Wow that looks like a pretty sweet place. I have TRIED to keep my build under 500k, but its not gonna happen. I am estimating 550k but its probably gonna hit close to 600 by the time its done :(.
So im building mine, well... trying to. I just go an earthworks resource consent and getting a building consent at the moment. We have to spend about 80,000 on retaining and digging because its on a sloped section. There is no site access for a few weeks so that should match up nicely with the building consent time the council need to fluff around, so all in all im pretty excited.
Our house is going to be fully brick. We have picked a Euro brick, white for the whole house.
I have a separate lounge, and open plan dining living area which has our kitchen and indoor/outdoor flow.
We have tried to be practical about heating etc. So have gone for Gas hobs and hot water but decided on using a heating system (heat pump) for the actual heating.
We have a scullery going in and have upgraded our kitchen bench top to engineered stone.
I am going to get the house wired up with cat5e/6 for the network and probably pop a couple high quality access points in for my network, a patch panel in the garage and have my modem/router out there.
We have shunted the idea of getting tiles. Personally I really like them but my wife hates them. So we agreed on getting some Karndean laminated flooring (it looks like wood planks) in most of the downstairs and the wet rooms upstairs.
Once piece of advise, we actually got a colour consultant in to help us pick colours, it cost $120 dollars but I rekon it was worth every cent.
Good luck with your build.
How big is the house you're building and is it single or two story? Am in the process of getting our plans priced currently, we had a budget of around $500k also but expect it to go around $550k also, just interested in seeing what you're getting for a similar price.