We have a few realistic options in my opinion and i really can't decide:
Most conservative: Abidal - Caceres - Pique - Alves
This one would mean that we virtually only attack from the right, and Abidal helps out, perhaps a lot, with Caceres.
Most attacking: Sylvinho - Abidal - Pique - Alves
Pep will definitely want Abidal to play, so if Sylvinho gets a game it will be Abidal in the middle. This one would give us two attacking wingbacks; whether Abidal and Pique together could handle the pressure though...
Safest? : Caceres - Abidal - Pique - Alves
Most of you don't seem to trust Caceres in a central position. So you can put him out on left where he would be less likely to cause damage and throw things away, especially since Chelsea will probably not be strong attacking from the right. The logic behind this is the same logic as is behind the Puyol - Pique - Marquez back-three-from-the-left, that it's more of damage and risk limitation.
But I can't choose, or at least not until I think about it more.