Buster Posey for Manny Ramirez?

The only thing about Buster being hot right now is that since he's a rookie, he could break at any moment. On the other hand Manny is older and more experienced but with age comes more injury. It really depends on who you have playing outfield currently becuase since you already have Mauer, you could save Buster and trade him for another player that you need badly.