I've decided to get a new power supply for one of my systems. I will either get a Sparkle 350W, Enermax 350W, or Enermax Whisper 350W. I know they are all good power supplies but I don't know how much difference there is in noise. Right now I have a Sparkle 300W and I don't want to get one with a louder fan. Also, how much difference is there in cooling between the normal Enermax and the Whisper? Thanks.