I like the Lian Li for their front mounted intake fans that suck air around, about and through their harddrives. No need to buy hdds coolers.
I like the no door front look, very practical, and also the extra exhaust fan on top of case. You can change the fans to Yate Loons, very cheap and quiet.
I've replaced my top exhaust fans on my PC-60s with 120mm, after resizing the holes with a Rotozip. The cooling temp within the case is excellent.
There are many add ons available online but wouldn't it make sense that if overheating is the predominant subject, would it be smart for one to investigate the better cooling properties of aluminum and the well engineered designs of LL and their airflow. You be the judge. Others may try to sway you, but a picture is worth a 1000 words.
http://www.lian-li.com/Product/Chassis/...lassical_PC-6x_S/M_C_PC-6X_S_PC-60.htm