Right now I think my two personal favorites are Washington and Long. Why? They both have histories of being really good at things we have been really bad at in recent years. Our baseball IQ is among the worst in baseball. Washington is a guy who is known for his teams playing smart, clean, and top notch defensive baseball. That alone could add a lot of wins to this team. I know Washington is dog s%*# as a person, but with the White Sox, that sure doesn't disqualify you.
Long has been a top notch hitting coach for a long time, and this is a team who has had zero approach for a while now. Again, just getting guys back to their historic norms, and not even to their ceilings and potential adds a lot of wins to this roster.
That isn't to say I am against a guy like Espada, but I don't know his track record the way the other two stand out.