Originally posted by: Bovinicus
I would go with more than 300W. Although it may be enough, it is not a good idea to push the limits of a PSU. This can lead to odd stability problems and random unexplainable errors. In addition, it will lead to trouble if you ever go to upgrade. You have a pretty high-end system. Some of those components, the video card in particular, need a stable power source for proper operation. Don't skimp on the PSU. It is something many people regret shortly thereafter.