Antec Earthwatts Ea-500 500w
@ 2007/02/10500W is enough to power mostly all mid-range systems, the Antec's one has excellent efficiency rating, or so they claim:
"The EarthWatts product is Antec's attempt to address the specific needs of those looking for the most efficient power supply available. The EarthWatts is 80 Plus certified; meaning that it has 80% or better efficiency at 20%, 50% and 100% of the power supply's total capability. A typical upshot to a power supply that is more efficient is that, because less power is wasted as heat, slower, quieter fans can be used to cool the power supply unit
"The EarthWatts product is Antec's attempt to address the specific needs of those looking for the most efficient power supply available. The EarthWatts is 80 Plus certified; meaning that it has 80% or better efficiency at 20%, 50% and 100% of the power supply's total capability. A typical upshot to a power supply that is more efficient is that, because less power is wasted as heat, slower, quieter fans can be used to cool the power supply unit