Nene isn't fast enough. I find pace to be just as important as last year, I had a hybrid with Eto'o and Doumbia up front and Gonzalez and Sturridge on the wings (all 90+ pace) and won 12 straight games through division 2 and 3 with them, after having a pretty modest record in the bottom 2 divisions with a very good La Liga team (Song, Cesc, Navas, Falcao, Villa, Pique, Masch, etc..). I'm rocking Bastos atm.
Back four is Mariano, Dede, Santana and Siqueira. I used David Luiz in my hybrid and he's still OP. Dede is lethal from corners. Need a better LB though, will probably get that silver player Cesar.
Best players i've used so far: Tello, Sturridge, Jonathan Pereira, Hart, Mirallas, Ramires, Dede, Falcao. Eto'o is easily the best i've used though. Was disappointed with Cesc, Neuer, Mascherano, Navas, Chicharito, Javi Martinez.
With the money you have, Sell Santana and buy Naldo. Not as fast as Santana but he is fast enough (74 pace, and is always there blocking shots (80 strength and 80 interceptions - http://www.futhead.com/fifa/players/4370/#
), and if you got Dede you dont need 2 fast defenders. Buy Maicon if you can afford it if not buy a RB called Johnathan (http://futhead.com/fifa/players/3784/#.UHL-dVFm_AE
). Marcello is worth every penny at LB for under 40k.
As for your wing, you should keep Bastos (absolute monster strength and 82 pace), but I preferred Nene. His pace lies and can out dribble anyone. I think there are better players you can spend your money on.
Here is my brazil squad -
I want to swap Vagner Love for Pato asap, then probably save for Dani Alves.