currently have a GS600w gold standard psu wanting to buy a new video card. Looking to be able to play all normal less demanding games in ultra and hopefully bf4 type games in ultra or close to it as well. Looking at an evga gtx 760 or 770 not sure what to get, 100$ difference so if the 760 will play ultra on all online games/99% of games not sure if it will on bf4 or the newest crysis but that'd be nice. i5 4670k asus z87-k evga gtx 550ti currently-needs to be updated GS600W. will my psu have the right connectors for either of the 760/770? which one is better to get for price/performance/demanding games?