When it came to power supplies, my first thought was to total the wattage of the various components and get the power supply that was the best fit. However, this turned out to be hard as very few of the components had their wattage listed by Newegg . I then just picked a quiet power supply made by Lian Li, however Judy had a better suggestion: get a "modular" power supply. Modular power supplies have fixed cables for the motherboard, and then sockets in the power supply for plugging in cables to power the components that you have. This reduces the number of loose cables that are laying around in the case taking up room and blocking air flow.
She is partial to Seasonic and Corsair, but recommended that I look at an article at Silent PC Review for really quiet ones.
Finally, she recommended using Newegg's wattage calculator.
One thing to be careful about is to ensure that your power supply will work with your motherboard. There is an issue about 24-pin vs 20-pin power supplies. Apparently, 20-pins were the previous standard for motherboards, with 24 pins being the new standard.
I ended up getting SeaSonic M12II-SS430GM 430 watt modular power supply. This power supply also had CrossFire support, so if I ever did add a graphics card that was capable of interfacing with the graphics chip on the motherboard, the power supply would be ready.
The Gigabyte motherboard is described by Newegg as being a 24-pin motherboard, while the Seasonic power supply is described as a 20+4 pin power supply. (In reality, the Gigabyte has 4 pins of power supply separated from the other 20, so it may itself be a 20+4 pins motherboard. I'll find out soon.)
Judy assured me that 430 watts was more than enough for the system that I was building, so I didn't use the wattage calculator.
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