Obviously you are in Australia, which might put some stoppers on things you can get. Try a TalonRa 8/9 head for their 14 footer. it is 32 feet and 490gns. Or you could try standard heads or lines in 12/3/14 weight class.
Other options are Loop adaptive heads, the 8/9 ss is 30 feet plus the adaptive tip, 9 feet 30gns, which gives you a head of 39 feet and 446 gns over all.
Look at
www.Looptackle.se
You might find that fast sink lines are better in surf and off other platforms, most fish in salt water are caught under the surface anyway.
NOt many people in Aus use or keep DH bits and pieces, but if you want to try a cheap, very, full 12 # line, then I can get one for you at miserly prices. Its nothing flash, but its 13 dollars, and you can't complain about that.
Other options are LC 13 or T14 heads which in 35 foot lengths are LC13,455gns and T14 490gns. Ypu should add a good tapered leader about 6 feet long with the butt diameter matching the LC or T14 line to stop dumping.
If you have any questions, send me a mail. MaxG