I'M fan of the nzxt clc's. For a single radiator, the x41 has amazing performance, equaling that of the dual size h-100i, and quieter too. It's larger brother, is a step above, equaling or beating the performance of the h-110, and will hang with the h240x, only loosing benchmarks by 1-2°.
The thing to remember with those big coolers however, is that they will perform exactly the same as a smaller cooler, you will only see temps at idle a few °C above ambient. According to just how hot you run the cpu, how much OC, will determine just how much cooling potential you really need. For instance, imagine putting a h-100i on a 4690k at stock speeds, and a hyper212 on the same cpu. You'll see the same temps at 100% cpu usage, and idle, since...