if you want the overclocked one it will be the i5-3570k which in my oppinion is more than enough to handle both of those cards and won't bottleneck you at all.
Ok, so since I'm using CyberPC, they will overclock it for me right? And If I chose the Extreme overclock option, how much faster would it be? I'm a complete noob when it comes to hardware, sorry. Also... what is bottlenecking?