Whats the real difference between the two? I've been looking into getting a new ps. I have an Antec case with a 350W Smartpower in it. Seems to work fine. But about 3-4 times in the past week, my system has just up and shut down on me. Not like a power failure shut down, I mean it went through the normal shutdown process as if I shut it down myself. To be honest, I don't know if that is a power supply issue or a Windows problem. Newegg has the TruePower II 430 for $69.99 and the SmartPower 450 for $66.99. Recommendations?