Corsair 550D Case Review @ OCC
 

In all honesty the 550D performed just as well under load as any other midrange mid-tower chassis that has come through my hands. It truly is one of the quietest cases I've ever had. I'd use it for a home theater case if my setup allowed me to have an upright tower…it was so quiet I had to literally check to see if it was on, it just didn't make enough noise. With all the sound-proofing and closed up holes, you would think it would be really hot, but somehow Corsair really won this one out. It's relatively cool and sure as heck quiet; great performance overall.

http://www.overclockersclub.com/reviews/corsair_550d/