Sims GTX is the way to go. The new Guide jacket is very nice, but you could probably find last years top of the line (Rain Cloud?) on sale($220?). The Patagonia SST is good too but I like Sims better. These are both heavy jackets best for standing in the rain all day. If it might rain, these jackets won't be in the back of the vest. The Patagonia Deep Wading jacket would be a better choice in that case. Light enough to pack in your vest, but with good fishing features ($180.). If it is a "just in case" item, Orvis($60?) makes a cheap non-breathable wading jacket that will get you through the day.