Where is Oz are you?
You should be able to get hold of a Ke Nalu demo through any of the retailers listed on the Ke Nalu Australia website.
The new Ho'oloa blade is awesome for flatwater / DW

The 100 flex shaft is super stiff and great if you like direct contact with your blade but you've got to be fit and strong to handle it.
The 90 flex has been the most popular shaft but the xTuf(S) seems to be catching up in the popularity stakes.
I use a thruster set of Shapers carbon stealth S9's in my 8'0" and love 'em......heaps of drive!