If you are going off the continent of Australia for your living or visiting, consider going to a supplier from a colder climate.
I say that partly because I have heard of an Aussie couple who went to Japan for a skiing holiday and found themselves always cold. That could be true because Japan may be a more humid climate than Oz.
My favourite place to go for winter wear is Mountain Equipment Coop, http://www.mec.ca
. I have one non-down, but artificial fill insulation jacket for 5' to -15' with low to moderate wind. My down jacket I wear when the wind is over 40 km/hr or the temps are below -15'. I live in a humid area of Canada. Salt water is less than 5 km from my home.
I have called MEC, when in doubt, and they have told me that one of my possibilities was really made for Canada's Prairies - Alberta, Saskatchewan, Manitoba - where the climate is dry.
I have been using MEC as one of my major outdoors suppliers for 40 years.