I had mine 'made' by K B Clutch Engineering in Sydney, the clutch is good quality and well made, though I ordered a 5 puck, he ran out of 5's and sent me a 6 without telling me, and thought that was on ok thing to do. Apart from that, it's a good service. For around the $400 mark you will get an exedy 4-5-6 puck sprung brass button centre with ceramic pads and then he will make you a custom pressure plate depending on your power/torque levels. Mine is rated at 1300kg clamp pressure / 240kw / 440nm / 6400rpm and cost $400. Seems like the way to go, you would probably get a similar clutch with a higher clamp load. I just finished putting mine in this afternoon and it feels almost like a normal stock clutch with a bit shorter travel, it's very easy.
How is your tailshaft? Good time to change the uni's.