How about the newly released NH-C14S?Well the Corsair H110i is supposed to be pretty good, but the reason I bring it up is because it allows you much more room around the memory slots and PCIe slots. Big tower coolers extend over them sometimes.
I compiled some benches from it there but it looks to be VERY close to the DH15 in performance. While being VERY VERY quiet. It also gives you very very good space around the components and has some other cooling benefits that I'm probably not qualified to talk about but are within the reviews I linked.
I mean, the issue is the watercooler is louder and not benefit over the DH15 right? So I just don't think the H110i is worth it with the NH-C14S coming so close to the DH15 (and most of these are in single fan testing you can add a second fan) and with how quiet it is and how it leaves you full room for your components (unless I'm missing something).
Take a look though, see what you think. I'm no cooling expert, I have an intel stock cooler on my 4770k, I'm JUST updating it now and the NH-C14S was my premium option.
I think I'll go with the Thermal Right True Spirit 140 for $50 since it seems to be as quiet as it gets without spending a pretty penny. The DH15 just looks scary to me lol....
I like the THermal Right as it will blow air directly out of my case, but would like to hear more about the benefits of a C cooler like the NH-C14S as I just don't know much about CPU cooling.