The ASRock Z68 PRO3 GEN3
should fit you perfectly.
It has several overclocking presets built-in bios, so you don't have to mess with settings by yourself. You just let it do the trick, and it pushes out max of your K series processor. My i5-2500k with this motherboard was easilly overclocked to 4790mhz, which I find very respectable. The only drawback is high level off standby hissing, noticeable from audio output of this motherboard. http://www.amazon.com/ASRock-Z68-PRO3-GEN3-Intel/dp/B005N5Q2MW/