Considering there was no budget mentioned.......
I have 2 cases for my systems and both provide great airflow. Both are from Cooler Master. I have the 932 and the Cosmos 2. I love both cases but the Cosmos 2 is my preferred. It's bigger and that means more room.
When choosing a case placement needs to be considered. My Cosmos sits on a Lazy Susan so I can spin and clean/service as needed. The Cosmos is a very heavy case empty so keep that in mind also.