If you have to go through Goondi then your best bet is to keep going down the Newell to Coonabarbran, Mendoran then across to Dundadoo, Gulgong, then at Mudgee you`ll start seeing the signs to Sydney. The roads from Goondi to Mudgee are pretty good, beautiful countryside too. Can`t tell you anything about Mudgee to Sydney though...

Take a map with though just in case... lol