If the 300D will meet your needs, and I suspect that it will from what you have said, I would consider putting a Wanted To Buy (WTB) in this Marketplace forum here, photo.net, and on FredMiranda.com.
I've purchased a lot of gear on these forums from knowledgeable and good folks with discounts ranging from 20-45% off of list for practically new equipment. Fredmiranda is a high traffic site, and you'll get plenty of bites within an hour or so, but make sure to check the feedback threads before purchasing. Photo.net is also very good and has a comprehensive feedback mechanism with revision history for all ads. The Marketplace here is not as "fast" but you'll get quality folks with a good reputation on this community. This is the only way I know of buying used equipment at a reasonable rate.
You should be able to get a reasonably used 300D for $450 US or $590 AUD for body only if you are patient.
Let us know what you end up getting.




