Corsair 750D + 3x Cougar Vortex PWM Fans $99.00 after MIR

I actually have one of those fans on my heatsink, seems to have better airflow than the Xigmatek it replaced (last XSF-F1252 from a 4pack) since it dropped core temps a couple degrees, also the quietest fan in my system until ~1300RPM.