Singapore Airlines would definitely be the preferable option as I they must truly be the world leader when it comes to long haul travel followed closely behind by Emirates.
However, due to the weak American dollar the Malaysian Ringgit (which is tagged to the dollar) is taking quite a hit as well. I'm sure you could save quite a few bob flying with MH to KL and then buying your KUL-AKL return in KL. Malaysian Airlines offers excellent service with all the trimmings and KL is definitely worth a stopover.
Hope to be of help.