Neymar is not only a talented player, he's an extraordinary talented and the biggest name in South America right now. I'd sign him because I'm curious to see Messi, the best Argentinian, best player in Europe, with the best Brazilian in one team. Plus you can expect big part of the money given for Neymar to return with different sponsorship deals, TV rights and merchandising. I don't want to see him ending in Madrid, Paris or Manchester
You always can find good defender for free, or for less than 5-10M euro. In January I'd go for Diego Lugano on loan, who is not needed at PSG. Tito should have signed Botia, but I couldn't understand Barca's transfer policy