So currently I have this case and I have 4 fans set up. Two exhaust (top and rear) and 2 intake (side and front) I have a spot open to put the h75 in the front but my question is, should I put the h75 as an intake or exhaust? What would provide the best cooling solution?

I have a GTX 970 btw. I don't mind moving the fans around if it's gonna help in anyway.