I've tried a number of wading staffs, some where too light thus tended to float and a couple of the collapsible ones collapsed or broke at the wrong time (not really a good thing). Used a ski pole with the bottom filled with a bit of hot lead which wasn't bad.
The best one by far was a staff that I bought from Speyghillie a couple of years ago (Sharpe's of Aberdeen Wading Staff). Bottom weighted with a great strap system that keeps it right out of the way when fishing. He has brought a few from England for people who wanted them the last couple of fly fishing workshops that he put on. This staff is bottom weighted and stays put. Put it through it's paces here and on the big Steelhead waters at the coast. Now I wouldn't step into a river of any size without it, saved my bacon a few times.
You might check out some of the local fly shops to see what they have in staffs based on my above comments or send Speyghillie a pm.
Hope his helps