www.xe.com, in there you will find a NZD to AUD converter, use that before posting nonsense.
RIPS RB30 awd stock rebuild 600hp/7200rpm from rips (new bearings, trust oil pump, 4wd block adapter, sump, and all the other mods) = $4080 AUD. Try building a similar rb26 thats can make that power, torque and response for 4 grand. You can even sell your stock rb26 bottom end off for lets say of $1000+ making it $3000 for a 600hp bottom end.
The "17kNZD" Rb30 fully forged bottom end ready to bolt up = 13,700AUD, thats a 1200hp bottom end for 13K, with the benifit of torque/response over the rb26. Sell your stock rb26 bottom end for $1000+ and put on the rips rb30 and you can have a 1200hp bottom end for around 12,500 AUD, sounds like a great deal to me, no wonder r.i.p.s are selling these by the dozens.
Some how i dont think you can come close to beating that.