I'd say Garcia, and Lescott are both in the same position. Kompany and Nastasic are our best two centre-backs, and Boyata, despite some wayward passing is at least on a par with Lescott. If we are to have three top draw centre-backs then the Pepe move is a good one.
Pepe would be a class addition and mean that either/both of Lescott and Garcia could be sold or loaned out.
I have never seen much from Richards at centre-back since Sven played him there, he's much better at right-back.
Garcia, Lescott, Sinclair and Kolarov can all be improved on. If we can sign Coentrao for under 10 million, and move Kolarov on then that would be great business.
Garcia needs to go fullstop. Gustavo is supposed to be available, and is the right age, He'd be an upgrade on both Barry and Garcia, so even if he was only here short-term he'd be worth pursuing until we could sign Gundogan or Kondogbia for instance.
The icing on the cake would be another forward to replace Sinclair, Ljajic could be the player, he's young enough, and like Gustavo would be an improvement on what we have.