I would suggest you to add 2x140mm fans on the top and 1x140mm fan to the side. I think you already should have 1x200mm fan at the front and 1x140mm at the back of the cabinet.
I would suggest you to add 2x140mm fans on the top and 1x140mm fan to the side. I think you already should have 1x200mm fan at the front and 1x140mm at the back of the cabinet.
Is should already come with 4. Add 2 of these and the case will be nearly full. (still short 1 140) http://www.newegg.com/Product/Product.aspx?Item=N82E16835146003
Notice the airflow in CFM when looking for fans that move a lot of air... More air also means more noise. You have to choose your priorities.