For the phase after the PPL which is generally pretty costly - i have been flying with Bruce Hartwig which is based at Parafield in Adelaide, next door to FTA. They are pretty good and operate the DA-20, PA28 and some twins. Their base rate is about $120 AUD for a DA-20 then you pay for fuel but it works out around 125 AUD / hour - not bad.
Flying in Australia is a little different to the UK and if you're interested i have written an article
here so if you are thinking about it then it's worth reading this article first and planning properly. Things like DR, fuel checks and time checks need to be proficient if you are planning to fly day VFR.
Hope it helps,
AHMC