Is Neymar really neccessary? I don't think an outside player who wasn't built at La Masia will be our next Messi. We have Cuenca, Tello, Deulofeu who will continue to improve and if we really want another versatile wide player, Marco Reus would be a good option. He'll be cheaper and has more physicality to his game with his height (6'0 vs 5'9) and frame.
We should use the money we're saving for Neymar and get Falcao or Cavani while their at their peak. We have wide players o'plenty (Messi, Pedro, Alexis, Cuenca, Tello, Deulofeu) but we haven't replaced Eto'o yet (Dongou is still very young).