You'd be looking at psu's at atleast 700w. That can deliver over 45A on the 12v rail.
I can recommend the Corsair HX 750 as it works for me very well and in other sli'd pcs. Depending on your budget and depends if you want to spend more so in the future you could upgrade the 770's to maybe 970's. Depending.
I still recommend the Corsair HX750 and also if your budget allows the Corsair AX 760i. The 760i is a higher tier psu but also much more expensive. Either one will run your setup just fine
-good luck