The other thing to take into consideration is this:
The rest of the world thinks that the Aussie scrum is a joke, despite there being several memorable games in the last few years where we have utterly crushed full strength scrums from England, Ireland, SA, Wales and Scotland.
NZ have usually not been a terrifying prospect, as they have a similar mentality and don't use their scrum as a method to impart dominance on us. The aforementioned teams DO, and until we put (properly, and for a good few YEARS) the percieved weakness to bed, by dominating every scrum we oppose, we will continue to get shafted by refs.
The Ireland WC game is the perfect example. Anyone with half a brain could see that the Irish were hitting the mud first in well over half the collapsed scrums, yet Lawrence penalised US! Take out the reputation factor, and that game may have turned out very differently, as we may have had a chance to actually get a bit of momentum up.
Bearing all that in mind, we simply have to go for the strongest SCRUMMAGING front row:
Robinson
Moore
Palmer
Nau
Alexander (to replace whichever prop is buggered, most likely Palmer, AFTER we've set a good solid 50mins of good scrummaging. He's a good tighthead, but not better than Palmer, and not better at LH than Fatcat. Superb impact sub)
With Horwill packing in behind there, the other 2nd row needs to be a Brad Thorn esque mongrel, who can support the tighthead side of the scrum. Who THAT is, remains to be seen, and is one of our 3 problems positions, the other two being 8 and 6. (No, Palu is not the answer, and neither is Elsom).