I'm upgrading to a Fractal Design Define S case and will be swapping the stock fans with some Noctua's. The problem is that Noctua's are expensive so I want the case to have as little fans as possible while doing the job. If it matters my build is a GTX 970, i5-4670k with a mild 4.1ghz overclock, hyper 212 evo.
Some ideas:
Front intake, rear exhaust
Front intake, rear exhaust, top exhaust
Front intake, bottom intake, rear exhaust
Etc.
Would love to hear your advice, thanks.