US Airways are running another 100% points bonus for purchasing points through to April 15th.
For those of us in Australia & NZ, the two best deals to be had are 30,000 miles for Business Class return between Australia and New Zealand on Air NZ, and 110,000 miles return between Australia or New Zealand and the US – you can even route via Asia, but with no stopovers, unfortunately, although you could always try and time your booking with a layover of less than 24 hours in a Star Alliance Asian hub.
30,000 miles for an Australia – NZ return flight can be had for $564 US, and the cost of 100,000 miles (the maximum purchaseable in this promotion) is $1881.25. You could top up the 10k extra miles as the normal rate; meaning a return to the USA in Business Class for <$2k AUD and a return trip to/from NZ and Australia for ~$500 AUD. Pretty great value.
As usual, my preferred tool for checking Star Alliance availability before booking with US over the phone is awardnexus.com.