What do I need to consider when buying a new case?

[imback]

I need all the details on what to consider when buying a new case so I wont have a mistake.

 

[realchaos]

Good airflow and cable management.
USB 3.0 (not a huge deal-breaker, but it's generally better to have front panel usb 3.0).
Big enough for your needs.
Looks good to you.