What CPU and what type of OC are you wanting/expecting...guessing here it's an Intel the Have the Hyper 212 EVO on a 2500K 24/7 at 4.8, another on a 3570K at 4.7 24/7 and had one with my 4770K at 4.4/4.5 running 24/7 while I was waiting for them to release the CM GTS V8, on the 4770K it would have been fine at 4.6 with the Hyper threading turned off.
On the sticks go with the Ripjaws X, they have the tighter CL, and have much more OC headroom, the Corsairs you are paying a massive premium for their name, GSkill continues to be the innovation leader (coming out with newer and higher freq sticks)