I have no issues with my current power supply, except that its noisy as #$%#. And I want to move my PC into my bedroom, so I want one thats super quiet. The computer probably doesn't even need 300W now, but I will be adding a video card (GTS 450 or 5770, maybe a GTX 460) soon. I figure probably 450-500W should be good. So what PSUs are the most quiet, and not too expensive?