Are you sure you did that correctly? I ran through it real quick with 2 hard drives, 4 120mm fans and everything else you said. I even swapped the chip for a b3 Q6600 that uses more juice. It came to 343, I think you'll be fine. If your going to upgrade to a powerful gaming video card,then you might need an upgrade.
No, I do not plan to upgrade the graphics card. I do game but nothing the card cannot handle. No overclock either, just a simple desktop. I ran the numbers again and same rating. I will take your word for it though, thanks for answering my question and peace of mind!