I agree with DnaAngel. You're shelling out $50 more for a 2-4oC better performance which, IMHO, is seriously worthless unless you're planning to really push as far as possible (in which, if you did, you likely won't be asking this question). Even a Hyper212 Evo can go a long way, and they only cost $35.
That being said, I recommend the NZXT Havik 140. Haven't personally tried the OCK or the DK2 but the Havik 140 is second only to the D14 in my experience (well 3rd if you count the original H100.)
Water displaces heat better then air (think jumping in a 32 degree pond as opposed to standing outside in 32 degree air temp). So no matter how good the air cooler is, water will still perform better in most cases. I was jsut stunned at how well that darn air cooler performed!
Water does displace heat better than air, but design also plays a big role. Fact that you're only seeing a minor decrease in temps when switching to a H100 from a D14 proofs that. At its current state, AIO water coolers just ain't worth the money compared to high-end air coolers IMHO.
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