Big things to keep in mind when choosing a case are the secondary features of them.
Most people will brush off everything, and choose based upon durability and looks, which is often rather foolhardy.
3 huge details you need to be cognizant of:
1. Expandability- Does the case have room for future upgrades; and does it have enough room for all the components I hope to add?
(Radiators, extra HDD's, front mount HUD's, Disc Burners, Large GPU/Multiple GPU etc.)
2. Breathability- Airflow is paramount in a quality case. The good working of all of your parts depend on cool and dust-free operation, prolonging their life, and ensuring dependable performance.
3. Isolation- A great case won't only protect your parts, but protect your ears as well. As someone who has used countless different cases in countless builds, a massive part of what determines what cases I enjoy is the sound isolation. Nothing is more annoying than a loud PC.