I am intrigued by the wide variety of hiking staffs, up to and including ice axes, that have been useful over the years, especially in unstable situations like fording streams. In rattlesnake country I always give my stick the point position.
From cheapest to most expensive:
1) a sapling plucked from a brush pile and shaped with a multitool
2)a mop handle found on a beach. With a banged up wrist, I really needed a walking stick. it worked for years...
3) a replacement shovel handle -$2 - modified with a wrist loop
-really tough and versatile
4) a set of collapsible trekking poles (I prefer to use just one at a time) - lightweight and sturdy as well as easy to stow when not in use - probably my most frequently used, although not a very strong rig.
5) a five foot long aluminum staff - really strong but unwieldy in many situations - $60 or so on sale
6) for the hiker who has everything -
http://www.bladehq.com/item--Crawford-Knives-Survival-Staff--12525 -must be a bargain at less than $300. Buy me one and I will graciously perform the field testing....
7) When conditions are right, nothing beats a suitable ice axe, but it is definitely a specialized tool