Mitchell and Lendal both use a Double Torque bent shaft that is ergonomic and has an indexed right hand but a completely circular feel. It is like having the great grip you do on a straight shaft but at a more comfy angle.
I am using a Lendal 4 piece break down (double torque bent shaft) with Kinetic Power blades. Their Paddlock system makes a breakdown that is solid, with no minute movement at all! Jason Hale creeks these suckers and they don't break easily at all.
So I can carry a breakdown that is exactly what I usually creek with, and if I break 1 piece, it costs me 1/4 of what it would to replace the paddle (assuming I get the pieces back). Also, they ship you a piece, no more shipping the blade back to them. You can look at the shaft and locking system at www.lendal.com
, they do not have their whitewater blad shapes there but they do offer a variety. Mine looks similar to an AT 2 or Mitchell Kinetic (premier asymetric).
Mitchells are the nicest on the market, www.mitchellpaddles.com