At 500W the Enermax PRO87+ 500W PSU will be enough to power most current systems that are not chuck full of high end parts.  At a measured 86.4% and 90.8% efficiency at 115V by Hardware Secrets you can feel assured that the PSU is not drawing much more current than it is using.  The only major drawback to this unit is the price, at $140 it seems a bit excessive for even a 500W PSU as efficient as this one.

“The Enermax PRO87+ and MODU87+ are two series of power supplies with 80 Plus Gold certification. The two series are internally identical, and the one difference between them is the use of a modular cabling system on the PRO87+ models. We’ve already reviewed the MODU87+ 700 W power supply, which achieved terrific performance in our tests. Let’s see if the PRO87+ 500 W follows the same steps.”

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