Just a follow up on this, I finally got a new set of Koni FSD's installed. Was cheaper by about 50% to buy them in the UK (
High Performance Car Parts, Koni Suspension Kits, K And N Filters, Alloy Wheels - larkspeed.com) and ship them to Aus than to buy them anywhere here, crazy. Anyway, the ride is much improved! Thanks for the help and suggestions all.