So I got myself a new case recently, and overall actually quite happy with it. Unfortunately I've discovered my trusty old Corsair fan is now very noisy and requires replacing with a quieter one - normally it's PWM but for now I've had to plug in an old-school molex-based fan which obviously doesn't ramp up the RPM on heat increase. So I'm looking for a high-quality 120MM fan to fit on the radiator which has PWM - and which is preferably as close to silence as possible with good airflow. I do have case holes for a 140MM fan but my radiator is only 120MM so unless I'm missing something that's not an option. Advice chaps?