I am looking at a seasonic, 760w, 80+ plat.
SS-760XP2 is the newegg partnumber.
I am looking at this for i5 4670k, and a gtx 770. I plan on configuring sli in the future and wonder if this psu will be able to handle this while overclocking.
Yes it will. It has the power (700W or more) and the 4 6-pins, it is single rail so the amperage is not an issue and it is the best manufacturer for psu's right now.