Games dont use more than 4 cores so the 2600K's ability to hyperthread wont help performance . Even intel recommend the 2500K for gaming .
NONE of the motherboards you mention are really suitable. All use the H61 chip set . If you use them you wont be able to overclock . If you do not wish to overclock they can be fine but just get a 2500 not a 2500k since the K model is unlocked to overclock
Overclockers need boards with Z68 or P67 chipsets . Ideally Z68
Memory should be 1.5 volt [or less]
Of those graphics cards the 6770 , but none is particularly powerful . If you are gaming at 1080p resolution then a 6870 is a good starting point balancing cost with frame rates and image quality .
The huntkey power supply is dreadful . You could get one as a door stop , or to throw at dogs that wander into your yard .
Get a quality psu