My x760 can handle that build/load...I would go with the highest wattage psu though. All those talking bout the game time, if you've played bf or cod those hours aint nada. I am looking to update my psu but I think right now my system is fine.
I do think you should change that case to a nicer full tower...say the 800d,900d, tt urban s71, the new Lan Li's.