When I suggested the Cabela's model, I forgot about an inflatable one that I saw also. If you want to consider an inflatable style, you can look at Mustang Survival's fishing vests, they have a few styles. Six pockets, manually operated CO2 inflation. Here's a reference page:

http://www.mustangsurvival.com/products/product.php?id=228

I haven't tried these vests in particular, but, Mustang's gear is good enough that I see Mustang survival gear on commercial fishing boats, and I've seen Mustang suits on Coast Guard vessels at Woods Hole on Cape Cod.