My approach would probably be to stock a few fingerlings of every predator species I was interested in and could find a source for, and then see what shakes out. In a couple years, you'd know what kind of pond you have. I wouldn't worry about CC becoming a nuisance. If they reproduce at all, it would probably be an easy matter to fish out whatever you considered excess. They're not very efficient predators, and they don't churn up the bottom. I'd be concerned about the YP. I'd add them at the same time as the rest of the predators.
WI requires a stocking permit, and I don't know on what basis they're issued, i.e., a separate permit for each supplier, or each time you buy fish, or...? Sounds like it could be a pain in the neck.
Putting everything you might want in there at the beginning is a lot easier than adding something later. Once the predators grow, they may eat whatever you add as fast as you add it.
