Maybe SLI'ing massively power-hungry cards (like the 2900XT or 8800GTX) and having a massively overclocked and overvolted quad-core processor. Your typical not-quite-top-end system, with a single card and mildly overclocked processor, won't get anywhere near that figure. However, getting a power supply that's a bit more than you actually need sometimes helps with maintaining a low fan speed and operating the power supply at its peak points of efficiency - so less noise and less energy. In your case, the 610W Silencer is a good choice, since the quality lower-wattage PSUs at AVADirect aren't really that much cheaper (the Corsair HX520W would be a good choice, but it's only $15-20 less). You don't need that kind of power, but there's not a compelling reason to change it, either.
EDIT: On second thought, I say the Corsair PSU would be a better choice than the one you have selected. Not only does it cost less, but it fits the overall power range of your system better and is a little quieter than the PCP&C unit, if that kind of thing is important to you.
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