If you add a few more fans I think that computer may lift off the ground and fly away.
On a serious note though... As mentioned you should have air flowing in and out in a somewhat predetermined path. mine I have 2 80mm blowing in the front, 1 120 blowing out the back, and 1 240mm blowing out the top. This provides good air flow in and across the hot parts.
As a rule of thumb you want more exhaust than intake but you don't want the fans fighting each other for air flow. Make sure your cables are out of the way of your graphics card and processesor as much as possible too. In one side out the other.
Wax on, wax off. You will do good grasshopper