450, 500 or 550
What about 600 watt? Much more safer than 550 watt? Sorry for wrong put punctuation.
Choosing the right power supply is not as simple as picking one with the biggest number. For a PSU, the quality of the power supply is, by far, THE most important thing about your system. I still believe that the PSU is the most important part of your system, and skimping out on it could be a very costly mistake.
For mere mortal consumers, like you and I, we are not able to determine the quality of a PSU. Furthermore, we should not rely on a brand name to deliver a quality product; the Corsair CX-series is a prime example of this. For the best quality power suppliers, use this list (http://www.tomshardware.co.uk/forum/id-2547993/psu-tier-list.html) as a quick guide, but use review sites such as JonnyGuru or HardOCP to clarify that it is, indeed, a good power supply.
On that whitelist, anything Tier 3 and up should be fine for a budget system such as the one you propose. So in this case, I would have no problem suggesting something like an EVGA 500B. Whilst this PSU choice would be okay, if you have the budget for it, a higher quality PSU IS better.
The wattage is also an important aspect (but as discussed, not as important as the quality) when you consider the parts you put into your system. For a single card setup (not including dual-GPU graphics cards), a 650W power supply should have you covered for pretty much any configuration fully overclocked. You do need to be more mindful if you're planning multiple cards, at which point I would suggest something around the 850W range. If you build your PC in PCPartPicker, it has a rough wattage calculator when you spec out your system. Getting a power supply that's too small can cause crashes, BSODs, and can even damage your components.
On the flipside, it's also not entirely appropriate to buy a massive power supply. This is where the 80+ efficiency rating comes into play, which is better explained by the Lord, our God, GabeN Linus.

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