I think he'd definitely trouble Clottey and Collazo.
They're a good boxer/workman and southpaw slickster pair, but Berto's tenacity and punching power would overwhelm them. Clottey has a decent beard, but I don't think he'd take well to being hit with those kinds of shots.
And he's not exactly evasive Clottey. Collazo is the defensive guy, but then again can he absorb the punishment from Berto if he does in fact land.
At this moment he can beat JJC, Williams, Clottley, and Judah. I would give him those fights, against everybody else in that poll he might lose to right now. He's too young as he matures and gets more fights in he may be the majority of those guys.
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