The HAF X is fantastic. I recently moved from a Silverstone FT01 to the X and I couldn't be more pleased. Some people feel it's a bit ugly (and it's certainly not as elegant as the Silverstone was), but it's a great case in terms of features and airflow. Also for $200 it's pretty hard to beat, if you ask me.
Not sure if your new mobo has USB 3.0 but the X has front-panel ports, which is a nice forward-thinking features from Cooler Master.