I've had a 1/2 dozen cases so far but the Rosewill Line-M Micro ATX Mini Tower Case is my current and favorite:
For internal storage I've got a blue-ray drive in the top 5.25 bay, a 128GB SSD for the OS and a 1TB M.2 drive for emulation-related stuff. Also have a couple of 256GB thumbdrives where I offload stuff when necessary.
It's very cramped but has forced me to rethink my needs. I drastically cut down my porn downloading so haven't gotten additional hard drives in a few years. For my existing hard drives, I insert them into two 2-slot USB hard drive bays as needed. I like that they're not powered on constantly like when I had them installed internally.
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A story of one man and his obsession with the female anatomy.