I have a Primo Ethanoo case with EK PE360 and OCool 240mm (60mm) cooling my 7600k and FE 1080 system. Existing temps 30c IDLE and 60-65c LOAD (dependent on RPM setting). The EK is running 3x Noctua NF-P12 and the OCool 2x Apache fans both running around 7-800rpm. I would like to reduce my radiators to a single unit but can't decide between getting either the 420mm or 480mm. I am toying with getting some Be Quiet Silent Wings 3 either way. My computer is behind the living room and needs to be ultra quiet. I've reduced the fan noise to 500rpm but still finding it noisy - hence why i may get the 420mm variant and use slower 140mm fans. What would you recommend?