Hey Chucks,
I'd recommend the Billfish pack as this was designed to be fished on 15-24kg, the marlin pack has slightly bigger lures which will still work but at this time of the year we personally run the billfish pack as the lures suit the size of fish off sydney at the moment.
im working on setting up a 'personalise your own spread' page but at this stage its only the spreads available which still work great.