F Benson. If I remember correctly, he wasn't THAT good before he had T-John. He plays for a crappy team with a fair defense, and no O. The only thing he has going for him is a good closer. Pass.
I like a few guys on that list, but for the spot you are choosing for I would take somebody I would consider has the most upside. I think that is Armas Jr. He has the stuff, and has been in the majors for a few years. That offense with Vlade, Vidro, and Wilkerson can score some runs too. The biggest detractor is that he will be playing 22 games in Puerto Rico, which may rival Coors.
I like Wells too, but he has all the same issues that Benson has, less than T-John.
I don't think there are any guys on that list that are sure fire studs, but Armas is the best bet in my opinion.
You don't need a quadraphonic Blaupunkt, what you need is a curveball!....