When I did my recent rebuild, I decided to replace the existing 200mm Cooler Master fan in my Cosmos II case. That fan didn't move much air, often made low clicking noises and the built in blue LED was pretty weak.

This fan works perfectly and is extremely quiet. I'm not sure how much air exactly this fan moves, but once my chassis if fully sealed again I think it will do the job just fine. Do be aware of one thing however: the RGB cable connects to your motherboard or controller's standard RGB header and not the addressable RGB header. If you plug it into the wrong one, the fan simply stays one colour and can't be controlled.