Mosley, Berto in The Running For Miguel Cotto in June

[SweetPea]

Quintana might be an alright opponent for Berto, but only because he is somewhat of a puncher and Berto hasn't faced that yet. Quintana isn't better than Collazo, nor is Clottey, sure Berto could fight them, but I want to see how he stacks up against the best in the division not against guys who are consistently in the second tier(at least when looking at the welterweight division).

Quintana is managed to beat Williams and I'm not sure Collazo could have pulled that one off on his best night.

You might be right, but I think Taeth's point was that Berto needs to make a clear leap up to the next tier of opponents, and Quintana isn't significantly better than Collazo, and he might not be better than Collazo at all.
Berto needs to enter the Cotto/Mosley level of opponents.