Gentlemen,
For those of you contemplating the purchase of a power supply, you can use NewEgg's Wattage Calculator.
Simply select the devices that you want to run as well as the number of those devices you intend to have in your system. It is VERY accurate and should give you a ball park figure as to the wattage rating of an adequate power supply. Get a PSU that is about 50 watts higher than whatever wattage rating you get. The reason for this is to compensate for any additional components (read: bells & whistles) that you might want to add to your case later on (like fans, water cooling, etc.).
Please continue to submit corrections and additions. I have a few to make myself. When I return later this eve, I'll make a summation.
Thanks agin.