I've done the legendary Bucketts Way up to Walcha, considered by many to be one of the best bike roads in OZ
Bucketts is an interesting trot but I would never rate it near the best. The last time I did Bucketts, about 4 years ago, it was a death trap for cars and bikes with broken edges probably being the biggest danger.
There are many favoured road in Oz but for uninterpreted ride, challenging, scenery, corners, corners and corners, good predictable surface, yarda, yarda, yarda - The Oxley
. (But there are others.)