Don,
The main thing is to get a vest that is made for paddling because most ski vest are just not as comfortable. That said we have two models that seem like great fits for kayak fishing
MTI Play lots of pockets!, and
Astaul V-Eight Which has great fit, and breath ability which is pretty important especially in the summer month. I am not a big fan of the self inflating because come the unimaginable who knows if you will be conscious to inflate the jacket?
Hope that helps!
-Paul