Given you are in Toowoomba, you'd probably be okay with a lager yeast. I'm assuming your daytime temps in where you'll be storing won't be getting up to 20 degrees.
Having said that, if you use US05 and particularly Nottingham yeast (which tolerates lower temps than most ale yeasts), you'll get a lager-like result, whilst having the flexibility of an ale yeast, should the temps get up closer to 18 degrees. I used Nottingham last year in brisbane - I have a brick house and the underneath barely gets up to 18 degrees even during the day, and nights will stay around 10-12. I got a fantastic result on an APA and AAA last year using it.
I've done a recent AAA, when we were getting those 10-12 degree nights and US05 and it fermented out fine and very clean and the resulting beer is fantastic.
Good luck.
Goomba