Mr Boarman.

What part of Aussie you from?
I am originally from NSW.

There is a bow hunters web page in Australia with a lot of great guys that are more than willing not only to give you advice but also give you hands on teaching if you request it.

http://bowgroup.proboards6.com/index.cgi

But back to your question Arthur gave you some good solid advice.

I hunt feral pigs when ever I get a chance just love it.
Just make sure if you are hunting from the ground you have an escape route ie a tree you can either get behind or up in case the boar decides to give you some pay back.

I would not advise a xbow for the simple reason of time to load it.
In fact if you think you are going to need a bow that you have to load quick then get a recurve and shoot fingers as it does take some time to load a compound and hook on a release.

But before you go hunting no matter what bow you decide make sure you are comfortable with it and practice practice and more practice.
Cause I am sure you dont want a wounded boar chasin ya through the bush