Sorry Darren get rid of screw tops they fail in the end. Crown bottles the way to go. Did the same as you srew tops start with and crown tops. The screw tops start to leak. Get hold of coopers long necks if possible.
Where on sunshine Coast are you. Your lucky to get into homebrew now as there is a new homebrew shop in Noosa and Scott is very knowledgeable and will help you out. Everything you need he will help you out with. Happy brewing.