The first thing to check if you are minimizing power supply watts or costs is the 12V2 power rating. The CPU has exclusive "ownership" of the 12V2 supply and Intel recommends 13A continuous and 16.3A 10ms surge for a normally clocked 95W CPU. I would recommend simply going for 16A continuous to reduce power supply stress and conflicts in combined wattage voltages. Of course overclocking would significantly increase this CPU demand.
In any case, the way power supplies split total watts is not standardized and may not deliver this CPU power in correct proportion to the rest of of your system needs. That is once you meet CPU minimums, you may end up with LOTS more watts than the rest of your system needs.
For most home home systems will only the basic array of additional devices: integrated I/O motherboard, single or dual hard drive, DVD burner, 2-4 DIMMs, keyboard and mouse...there is more than enough power for the remaining system for any mainstream power supply.
For gaming systems the other key adjustment is for video card demands far outside the normal system power budget for. We are talking video cards which draw 10-20A @ 12V instead of the modest maximum of 4-8A @ 12V for normal non-gaming extreme machines. Occasionally other voltage supplies may come into play, but the 3.3V one is likely the only one that would be easily overtaxed in a simple system.
The more difficult decisions come when you add lots of additional devices like full blown RAID arrays, video capture cards etc. At that point you run out of assurance that you have more than enough watts on the general system supplies and you will need to add minimum and maximum power demands and guess at "normal levels" that must sustained for more than a handful of milliseconds. The key problem being a lack of information on which peak demands occur at the same and how long those peaks demands last (insignificant <10 ms or Much greater length).
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