Yep the Tamiya kit is the one you want. They should be readily available in Oz at any good model store.
I don't know what colours they come in mine is Green, I think I have seen a silver one here too. 8)
i've emailed a distributor here in australia to find out where (and if) i can actually get a silver one here...i've found the cost to me pretty much spot on $50 (damn i'm good at guessing prices of things!)