Hi Orton, my bf is a building designer and a builder in Canberra and he's recently used WT partnership for quantity surveying. He finds them pretty good.
Here's their link:
http://www.wtpartnership.com/index.cfm?l=en&c=au&p=165a77f8-c259-e4c0-16e5-09fe12572dfc&s=
Good luck.