Me and my boyfriend are from ireland and are also looking to extend our second year visa .. i know if you go onto the harvest guide and you knw exactly where you want to go ( if you just google it) it shows each area where you can go fruit picking and contact numbers of farms and hostles / accom etc...
We are hoping to find somewhere that will be a good laugh for the 3 months hoping to start start of april.. iv heard some horror stories have you heard good reviews of Mudgee ( what state si that in )
Good luck with your search