From $519.99 down to $499.99. Ships to Australia - make sure to click "USD" at checkout, otherwise it will be more expensive with Amazon's currency converting. Keep in mind credit cards charge a currency conversion fee but much less than Amazon's.
The ASUS models are generally highly regarded. Review here. Cheapest in Australia is $639.00 from MSY.
I have been keeping my eye out on price drops, and hopefully there will be more in future after Maxwell releases (if it ever does). Still, 780's are still a good product - VideoCardBenchmarks put it as 4th best card. If you're like me you might want to SLI.
is the 3 year warranty international?