I'm a pretty avid gamer and 2 years ago when I built my PC the best case we had was an old mid tower case with crappy cable management, poor airflow, and a top mounted PSU. I am in need of a case upgrade, and my requirement are: >$150, good cable management, a side panel window, and good airflow.
I picked up a Lancool PC-K62 for my last build and its done quite well for me. Its got great airflow, good cable management, a large side panel window, and the front dust filters are really easy to clean. The only downfall is that it lacks front usb 3.0.