Ah, C-dub, ya beat me to a good line.  ;)
Hi, my name is Ghost Paddler and I have weak ankles.  Trashed from playing too much (aw, what am I saying, you can never play too much) Ultimate.
Even with my "weak" ankles, my chotas are for the colder beginning and end of the season. Other than that, I'm a sandle guy.  I've gone through several pairs of tevas in the past 12 or 13 years and generally liked them.  When my last pair wore, I tried a pair of keens.  Put a pair through heavy usage last year and found the stitching blowing out--took them back to REI and got a pair of chacos, which I love--though they haven't faced a full season of use, yet.  The only downside to the chacos is weight, they are considerably heavier than tevas.  When it's not  too frigid, there is nothing like the feeling of feet in the water (the colder water keeps the swelling down in the ankles, too).
With all that in mind, when I go with my spring voyageur buddies, we usually carry one or two ankle aircasts, just in case of a sprain.