Hiya Chris, thought this link might help you. I'll be ordering a couple of things soon enough but until then and in case any Aussies get onto you this site should give you a good go.
http://www.defence.gov.au/Army/traditions/armoured.htm
http://www.defence.gov.au/Army/traditions/infantry.htm
http://www.defence.gov.au/Army/traditions/corps.htm
http://www.defence.gov.au/Army/traditions/sf.htm
I'll be in touch soon hopefully about one or two of those armoured badges. You'll also, naturally, notice how most of ours are modelled off British hat badges, immitation is the greatest form of flattery they say. Make it a bit easier for you though, all you've got to do is add a boomarang half the time.