Simple. You can either calculate the numbers (but it's near impossible for the mobo and peripherals), or go with a more powerful PSU, like a 550W.
There are advantages to using an overpowered PSU:
1-It won't heat up as much
2-because of #1, it is that less likely to fail.
Overall, you should look for the % of deviation for each line, mostly the 3.3V+, 5V+ and 12V+. 5% is normal. 10% is cheap. 3% or less is very expensive.
If you get a very powerful PSU, the % may not matter as much, but you'll have to go through the exercise of measuring the output (use MBM), and if necessary, tweak the PSU to line up the voltages properly.
Overall, it's all down to a cost issue, and what you're willing/able to do. Regardless, I wouldn't bother with anything less than 400W for your PSU.
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