Where should I locate my fans?

[icphoton]

I am thinking of getting a Fractal Design R4 case which comes with two fans, i'm also thinking of getting an h80i. Would I mount the h80i on the rear, sucking air in. I'm not sure what place would be best for the fans, do I need to purchase more?

 

[Karsten75]

Let the H80i vent out to the rear of your PC. Locate the Fractal fans in the front, sucking in air. I have a case like that and temps are great with that setup.