If you are not overclocking, you won't need the K version CPU. You also won't need such a high end Z series motherboard. Any decent H87 or H97 motherboard will work perfectly. For the power supply, unless you plan to SLI two graphics cards in the future, you should get a 600W to 650W seasonic or XFX unit. 750 is already too much overkill for a single 770 system.