Well, I think that Furcal and Cabrera are better than Gonzalez, so if you think Cabrera will still be on FA in a couple weeks when Gonzalez cools off, I would wait. Either that or drop Acevedo for Cabrera, because Rivera will be back soon anyway.
You have three proven closers in Foulke, Escobar and Guardado and might be able to trade one away. But, the problem in a 10 team league is that everyone may already have closers they are happy with so their value is limited.
Your strength is your outfield and your main weakness would be at 3B and SS. I think Cabrera is a more than adequate SS. Crede would be a slight improvement over Batista, but not by much. You might also want to take a chance on Hank Blalock, if he's available on waivers; he has been super hot lately.
I would say Armas and Myers are both about equal; they are both sleepers with upside but potential risks. Myers does play for a stronger team though.