I'm sure that we'll end with a CB... But I really don't think that it will be one of Luiz and Agger.
Vergini seems to be the last on the list and the only one we can afford ( I don't even want to think to those Rami, Mathieu and other bullshit talks).
If our management was smart, he'd have check in France where most promising young defenders are (Kurt Zouma...), or others like Koscielny, N'koulou (both excellent and the second one not that expensive), or Sakho (a little bit too slow but he's one year left contract and wants to leave because of Marquinhos/Alex/Silva).