The crew at TweakTown seem rather impressed with the be quiet! PURE BASE 600 mid-tower case they just reviewed. Here's a quote from the full review to get you started:
To date, this only makes the fourth chassis that we've seen from be quiet! While we saw the top of the line from them with the Dark Base Pro 900 chassis, we were also privy to seeing two cases which were a step down from the Dark Base chassis, and is when be quiet! brought forth the Silent Base 600 and 800 cases. The reason why we have you here today is to introduce one more series of cases from be quiet! at this time.