I'd say Russian Ratsnake, the one I have is awesome.
Active durring the day, great for display.
No agression, she will climb right up my arm when I open her cage, and she pounds the food.
She wasn't easy to find, I can't believe they are not more common, I have no idea how hard they would be to acquire in Australia.
I paid $90 for her +$50 shipping
Good article on them
http://www.reptilechannel.com/snakes...at-snakes.aspx
Pic of my girl last summer.
http://i946.photobucket.com/albums/a...IMAG0041-1.jpg