I recommend getting in the habit of using the online calculator as it considers all the components you might have - and lets you see true requirements.
Here is the link for the "lite version" that calculates total requirements.http://www.extreme.outervision.com/psucalculatorlite.jsp
If you can afford it, the more complete version identifies power requirements for each leg - it is very important with todays compononets to know in particular the 12v requirement as well as total wattage. http://www.extreme.outervision.com/pro.jsp
It only costs $2 for 3 day access and $10 for lifetime limited access.