I'll second the Maine Hunting Shoe as a good canoe boot.  I have the 14", but wish I would have bought the 16".  They aren't for everyone as your feet do get wet if you stand in the water for prolonged periods, but as the previous post stated it usually isn't a soaking.  You also need a little patience to tie the laces to the top!  They are excellent for wading rapids; the high leather tops protect your ankles and legs when your feet slip between rocks.  In addition, they won't flood with water like rubber boots, so they would be relatively safe if you dump in moving water.  The bottoms are resolable so they aren't throwaway footware like just about every other shoe today.  The bottoms feel like almost like moccasins resulting in a surprisingly nimble boot.  They also can be used for other activities like hunting, hiking or just walking around the town.  I also use mine in the winter with heavy wool socks when the temps aren't too low.