Why better quality? As i've read corsair is a good brand at PSUs. Also PcPartPicker says that my Estimated Wattage is 345W. And as PSU is 600W I think that it is plenty for overclocking. Or I am missing something?
Corsair is a good brand, but every brand has bad models. Coursair like nealy every other brand,
have a manufacturer, like Sertec, produce the PSU to given specifications, so they do not have hands on control over production quality, and sometimes it is just a poor design, even if it meets statutory regulations.
Where User reviews repeatable give the same or similar Cons, as one Newegg, I take notice and research thoroughally. Also return rates, especially in your case, try to cut down the chance, but of course cannot be guaranteed with any part. > http://www.behardwar...ns-rates-6.html
600 Watts is more than enough for your build but, distribution of that wattage and the Amps on the various rails need to be taken into account.