I use a 4wt for panfish and LM bass here in eastern NC. I can throw 2" streamers on my rigs. A 14" bass on a 4wt is no problem.
A 4wt is very light and very versatile. I can cast mine in the wind, roll cast, hit targets 60 feet away, and cast larger flies than you believe possible with a 4wt.
I've hooked some nice bass on those 4wts. They threw the hook out. If the hook stayed in the mouth, I'd have caught those fish. I'm guesssing the bass were 5 lb -7 lb range.
Get the 4wt and you will be able to handle any 16" fish out there!