I'm also thinking grey.

grey!

White, grey is too bland and fades into the background.

Grey

GREY

Grey looks much more stylish.

The current trend is grey. So go grey. By the time you need to repaint in 5 to 7 years time there will be a different colour trend. I think growing plants up against it would soften whatever colour you choose and not create the dilemma of colour choice. Maybe a climbing rose or clematis along it or pleached olives or capital pears grown for height - depending on where you live in Australia.

I agree with tessowen's comments

Go the Grey!!

definitely the grey

The grey matches the roof, this keeps the look on trend without too many colours, maybe soften the grey with plants behind the fence which have green/grey leaves maybe a hedge type or something softer, get an opinion from a nursery as to what would look the best to soften the look but still all tie in, seems grey is the favoured here but I still think some softness is required. I think the greenery is a soft foil to the roof colour and fence colour and will balance it all out beautifully.