I would select the plane based on price. They will all fly fine and teach you the basics of flight.

1. The LT-40 is a great trainer. BIG and Sturdy
2. Alpha is new here. I have heard good things about it....do a search on this site. I read something about switching the prop. Around $309 US in the States (complete)
3. Superstar - I would go with the Avistar over the Superstar. $299 US in the States. The radio is a basic Futaba 4 channel. It is a fine basic radio. (complete)
4. Extra Easy - I think this one is a more expensive combo in the States.

I have an Avistar and a LT-40. The LT-40 is much bigger. I prefered the Avistar because of the semi-symetrical wing.

I would buy the combo that is the most resonable in Australia.
I think you would be happy with any of the 4 planes mentioned.

Good luck!