Static Pressure Intake

hey guys. so i got a new case ( sort of... fractal design define s ) i need recommendation for what kind of intake and exhaust fans should i buy. and what brand. ( a list will be appreciated so much ) and i saw an intake at the bottom ( beside the power supply ) should i put a fan in there...

I've got two Noctua NF A15s that I won't be using since I'll be buying Chromax NFA15s for my NH D15. I'm trying to sell of the NF A15s but I only managed to find a guy wants to trade them out for three Enermax D.F. Pressure fans. I'll be using the Enermax fans as intake fans if I go through...

How can I tweak this build to make it so it can run GTA V at medium-high settings? http://pcpartpicker.com/p/XBvmt6 I'm on a budget, so making it cheaper will be great!