We definitely need a CB. Pique is not 100%, Puyol is 34, and Mascherano - well he's a beast, but still not 100% against the top teams.
Ideal choice for me is T.Silva - best CB in the world in my opinion, fast as fuck, great on the ball, and great in the air. Though he is 27 and Milan wouldn't want to sell. I'd take him for 35m-40m though.
If not him, then Hummels or J.Martinez. Both amazing players as well, both great on the ball and in the air though not as fast as Silva. Despite the rumours, we probably wouldn't be able to get Martinez though but Hummels for 25m I think is doable.
We also 100% need a LB. Abidal unfortunately won't ever play again, Adriano is good but is definitely no Abi.
Ideal choice would be Alaba, but those Munich fuckers won't sell him for anything reasonable (ie, <30m) so... Then there's Alba who I think is great and for c.10m-15m a bargain BUT he is not what we need as Abidal was solid as a rock defensively and Alba just might be too small? Last option is that Porto LB, Pereira who is probably the smartest/best choice for LB but no idea how much Porto would want? I guess if Porto won't sell for around 20m then another option is just get Alba and a CB then we can rotate Puyol @ LB/RB and Alves / Alba.
So, 35m for Thiago Silva and 20m for Pereira means 55m then get that fucker Drogba for free as a back-up striker.
= WIN EVERYTHING.