Max for sure. Okposo was just showing what he could really be at the end of this season. He seems to have taken a while to recover from his shoulder, but he finally started playing well again towards the end of December. I think he had ~20 of his goals after December ended.
As of right now Pacioretty; in the future, still probably Pacioretty. He's essentially what JVR is supposed to be. The head injury didn't even affect him at all. Patches is a legit 30 goal PWF (well, at least I've seen him categorized as one in quite a few threads before), it's damn hard to find those nowadays. Okposo's starting to come around, but till he gets there, Patches has the edge in all aspects.