Need two more fans for intake/exhaust on the case. Currently I'm using two shark fans on my side panel and two Silverstones front/back. I'm going to replace the stones because the sharks are a lot quieter at 7V, move about the same amount of air from what I can feel and look cool spinning or not. But then I found about the Cougars! A lot of people seem to like those and I kind of do too because of that blade design. I call it unique compared to other 9-bladed fans. Both the Sharks and Cougars have fluid bearings and move around the same amount of air (according to the specs) but I do realize buying four Cougars will end up costing more than simply buying two more Sharks.