i would make rafinha first choice, besides rakitic and busquets in three men midfield, then to go for pogba. Rafinha, and maybe next season samper to share some minutes..
Danis suarez will be coming back aswell. So buying pogba, not really.
Rafinha is pretty good and Samper & Suarez are good talents but they are nobodies infront of Pogba. He would be a huge, massive upgrade if Barca were to get him. So if Barca would get the chance to sign one of the absolute best midfielders around today at the age of 21 only(!!!), why not?