Wilko wrote:
My conclusions based on my experience so far:
-Get pads that stay in place (no turning or twisting around your arm,
-Get something that has a hard outside and soft inside. The completely
soft elbow pads don't spread the impact on a point that well.

Agreed, strongly. Some Protec elbow pads are soft, others hard like mine:
http://daddiesboardshop.com/ProductI...blk-sk-bmx.jpg

The "Tsunami" is the name of the Shred Ready model. I can't tell from the
online pictures whether it will stay on better than other models.

-Get elbow pads with a separate (hard) protection for your lower arm as
well. The chance that you only hit something with your elbow and not
with your lower arm, especially when you deliberately use your arm(s) to
protect yourself against an impact, seems pretty low to me.

Not sure I agree. When I hit my forearm, it gets bruised, but I seldom
feel any pain, and it heals quickly. Plus it hardly ever happens.

Brian Nystrom wrote:
There are a lot of good elbow pads for mountain biking that should work
well for whitewater. They start at ~$20.

The 616 (Six One Six) "Race" model I mentioned might be for mountain biking.
It can also be found on snowboard-oriented websites.