Well, I don't know tonnes about all the players, mostly just Kesler. I can't say who will be the best in my mind because of my lack of knowledge, but I do think Kesler has 65-75 point potential. He will provide good secondary scoring and play a great shutdown role. Of course, he may not put up that many points if playing a purely shutdown role...some pp time and different icetime against weaker opponents and he could surely find them though.
It's hard not to take a guy like kesler. He plays all out every shift, gets hit in the face more than anyone i've seen but never misses a shift. It seems like every time he heads to the bench he is hunched over after taking a high stick or skate (actually happened) to the face. also his speed is exceptional and is what makes him a difference maker both offensively and defensively.
I'd take Kesler. I don't think any player is going to ever score more than 60ish points in a season and IMO Kesler is easily the best defensive player of the three and should hover around 40-50 points throughout his career.