It depends on the system, but for the best stability and long term reliability you might want to consider a 400W or above. This used to not be a problem, but current systems need a lot of juice.
I often link to pcpowerandcooling.com since they have a table of average power consumption from PC components. You basically want to add everything up and then make sure that your psu isn't stressed beyond 70%.
It also depends on what rails you'll be using. Each power supply is different.
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