Rosewill RFX-120 - 120mm Computer Case Cooling Fan - Black Frame with Red Fan Blades, 2-Ball Bearing, Silent, 2-Speed with PWM Control

If you need to move lots of air the Rosewill RFX120 is the way to go. With 43.5 to 87.5CFM at 1200-2200RPM controlled by a rear panel mounted controller it will move as much air as you need it to. Its 2 ball bearing motor gives it the durability to keep your computer cool for a long time to come.