Gentle Typhoons shine when static pressure is needed (heat sinks, radiators, filters, etc.). Where the fans aren't required to have high static pressure, you can do better than Gentle Typhoons for airflow and noise. If you're using them because you have them on hand, put the AP-14s on filtered intakes and AP-13s on unfiltered exhausts. If you're shopping for fans to use for this case, the Nexus Basic / Real Silent is phenomenally quiet and are so-so for static pressure. Noiseblocker Multiframes are quite a bit more expensive, but are less sensitive to how they're mounted than the Nexus fan's sleeve bearing. They are also good for static pressure, though not quite as good as Gentle Typhoons. Both undervolt exceptionally well, and Multiframes have two PWM versions.
Adda, San Ace, and Globe fans are more like Gentle Typhoons in that they're quiet, but are better for higher static pressure / dBA than airflow / dBA. Enermax, Scythe S-FLEX, and Thermalright X-Silents are all great quiet fans (Scythe fans having having the most vocal supporters) without the emphasis on static pressure.
My preference: that case doesn't have as many intake options as I'd like, but... block off the top rear-most fan slot, use the top front-most fan slot as an intake, and cut away the grill on the rear exhaust. Put two AP-14s on the front as intakes, one Noiseblocker Multiframe (S1, S2, or PS pwm) as the top intake, and a nice quiet Nexus, Enermax, or S-FLEX as the rear exhaust. Hook the non-PWM fans up to the fan controller. If you get the M12 PS (pwm fan), take a cue from ehume and hook it up to the motherboard's fan header; that way it will spin up or down as the CPU cooler needs more air.
Keep in mind that your GPU is the loudest thing in your case, with the Hyper 212+ following in second. Even quieting all other system fans, the whole thing will still be noisy because of your GPU and the Hyper 212+ with AP-15s.