NRS is a very good whitewater brand and also make a packraft
http://www.nrsweb.com/shop/product.asp?pfid=1630.
But for whitewater, I dont think anything on this planet comes close to an alpacka. They can handle grade 4 whitewater (which is crazily scary for a non-rafter)
They make different models based upon your height and intended usage:
http://www.alpackaraft.com/index.cfm/tips-and-technique/Choosing-and-Outfitting-Your-Raft/2672(please note, the raft can handle the class IV whitewater but often the paddler can not, as in my case as I found out too late)
They were recently upgraded this year for better tracking with the extended rear. This is great for flat water, but if you dont really care that much, alot of the older models are appearing 2nd hand at significant discounts. my full packraft + spray deck + paddles + postage was about $1500.
My drysuit was $900 and misc (booties, liner, PFD, underwater whistle, knife, throw bags, helmet, river bags) was another $700 so you're looking at $3000 for a full kit-out.
As far as I'm aware, there are no packraft rentals available in Australia. My group of friends have 7 packrafts altogether and were thinking of renting them out because we hardly use them, but none of them were keen to do so. Here is a rough guide for prices at jackson Hole rentals:
http://jhpackraft.com/packraft-rentals/rental-rates/.
I recommend a drysuit rather than a wetsuit for really cold condititions. a full Kokotat drysuit would be very very expensive but they can easily be hired. I found my 2 pieces dry pants/top didnt work very well when you get dunked in raging water. A full 1 piece works much better.
Ive got a Gerber river shorty knife and an NRS Pilot knife and the pilot is much better due to its release mechanism.
http://www.nrsweb.com/shop/product.asp?pfid=2755I would also recommend a throw bag around your waist. If I had one earlier, maybe we wouldnt have jepordised my friend's life when trying to pull him over acrosss the raging river
http://www.nrsweb.com/shop/product.asp?pfid=1828.1&pdeptid=961With paddles many kayak paddles would not be ideal as the lengths are not appropirate. for whitewater packrafting, I have found that 210-215cm is just about right for me.
One of these contour or gopro would be great to record your expedition.
http://bushwalk.com/forum/viewtopic.php?f=15&t=6507&p=79547&hilit=contour#p79547Most importantly, dont just get the raft before your trip if youve never rafted whitewater before. Take rivercraft lessons and practice on alot of grade 2-3 before you head off on a big trip like that. Roman Dial's book has alot of good info as an introduction.
https://www.alpackaraft.com/index.cfm?fuseaction=store.catalog&CategoryID=52&ProductID=115Enjoy