Can't argue with your Goalkeepers.
Fullbacks is hard because it's a position often overlooked. Lahm is definately number 1 i'll say that much
I'm suprised you didn't include Puyol in your CB list ahead of Pepe. The rest i agree with
I agree with your CM's. The only one you could argue is Busquets, but it's hard to think of better. Vidal is one who comes to mind
On your attacking mids, Personally i think Mata is better than Silva atm. It's a hard one because there are so many great players in that position
Forwards, your not going to hear an argument from me, even though i am bias towards Marco
My favourites: Reus, Hummels, Mata, Falcao, Ozil
My favourite tennis players: Tsonga, Del Potro, Nishikori, Llodra, and i don't know haha. If we include all time then Sampras.