You might want to consider going to Redcliffe or Caboolture also. Much cheaper than the outrageously expensive Archerfield, although further away from where you're staying. I only have experience of one school in Queensland so cannot give you a comparison (saying "my school is the best" without experiencing the others wouldn't help you much anyway).
This has been covered extensively in the Dunnunda & Godzone section on Prrune, do a search on Brisbane and you should get some good results. You could take a look at Redcliffe Aero Club (Redcliffe obviously) and the Aero Dynamic Flight Academy at Caboolture.
Good luck, and all the best with it. Where ever you choose, you'll have a great time. Flying in South-East Queensland is stunning.