hey man, welcome aboard.
i owuld say earthwatts perhaps because of a slightly newer design?
it doesnt have all the plugs though, so you may want to use the adaptors that came with the card
i dont like recertified for psu, who knows what happened to it before.
although out of those? the silencer is the toughest of them all.
the kingwin is not too shabby either, but doesnt touch the other two mentioned
why not go for a corsair 850? actually 750
your cards will eat around 300 watts in normal gaming and perhaps
400 under 'stressed out situations'
Palit GeForce GTX 560 Ti Sonic 1 GB Review - Page 26/32 | techPowerUp
so you have to take in account another 150-175 watts for the rest of the system, not overclocked