How Many Watts (PSU) Does My Computer Needs?

I'm building a gaming rig and I heard that PSU play a major role. I've been researching I heard that 500-550 watts is good for gaming, but I'm not sure (due to many opinion and info) , and I don't really know how to use the 'PSU Calculator' , so I was wondering if someone could help me on this. This is my spec for my desktop (http://pcpartpicker.com/p/YCLcyc). Thanks in advance.
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  1. A 550 is fine, even a good 500 would work well, if you have a good price on the 550 that you are happy with, get it, a little extra never hurts
  2. Tradesman1 said:
    A 550 is fine, even a good 500 would work well, if you have a good price on the 550 that you are happy with, get it, a little extra never hurts


    Okay, thanks for the info. Just one more question, the PSU, can i bought any brand of it? Cuz all the mainstream brands are kinda expensive. Found a cheaper one, but I think that brand are made only at my country. Or this brands, FSP. Is it okay? I couldn't find FSP product at pcpartpicker.com .
  3. Some are pretty decent, some are so-so and bad, can check for the model here:

    http://www.tomshardware.com/forum/id-1804779/power-supply-unit-tier-list.html
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