I'd definitely swap Poulsen for Caceres. We get a young player with potential (he's got some tremendous athleticism), in a position of need (IMO if we do sign Caceres, we still need another RB option for depth - Grygera has to go). Plus we jettison that massive salary of Poulsen's.
Poulsen's a solid player, but he doesn't have the quality to start for a top class team and he makes too much money to be one of our subs. He's very replaceable.
Frankly, I'm still of the opinion that we never should have purchased him in the first place. I'm not trying to insult the player here, but he certainly doesn't have the same characteristics as the guy that everyone wanted... characteristics that our current squad is still lacking. Fuck, was our board ever short cited during that mercato.
Anyway, I don't think that Barcelona would be interested in a Poulsen/Caceres swap...