[OzStarGazer]

The first link you have posted... If you want to buy from them, the free shipping is only for the USA, and it is very expensive to post to Australia, almost like the scope if you add it to your cart to get an estimate...
The new Aussie service in the USA might help though...
I don't know the scope, but I assume it is mostly for planetary viewing.
I don't know if you can put the Heritage on it. I hope somebody will be able to tell you. I think the original scope is a bit lighter though.

PS: I don't want to hijack this thread, but if you know if I can add a GOTO mechanism to a Celestron Alt-Az mount and where I can get it please let me know (also by PM). I think my mount for the Astromaster is the same expect that it doesn't have GOTO.