Frys in san diego has the earthwatts 380 W for $19 after 25 mir. I have a question about these earthwatts specifically and other hi efficiancy units in general. They seem to mainly be effecient towards the upper end of their rating. e.g. try and keep the 500 watt unit running at 400+ during most use. Keep the 380 watt unit near 300 all the time. My current systems run 70-85 watts 99% of the time. Where do I find a high effeciency, 180 watt, active PFC PSU? Am I right that these antecs would only give me 55-65% effeciency on my HTPC system?