I am not going to provide a benchmark, as I am drawing off experience, I have never seen an air cooler beat a water cooler, it may tie it and win as per price, but in the real world, where dust clogs heat sinks, a water cooler will always win or perform the same. ( I find radiators much easier to clean out too). I could fact check your $120 price range of defeat for water coolers too, but I do not have the time and will instead leave you with the h100i, which is only $100 and beats every air cooler out there. why else would people who want to over clock use water? because it is efficient at removing heat due to its high thermal capacity. when a processor is maxed out, which I can expect this processor to be as it is on a work station computer which implies moderately heavy to heavy work, a water cooler will keep the maximum temps lower than an air cooler, show me a example where it wont. And once again, they said water not air.
But look at us bickering over the help for another person, let the information provided help this person find out what they want, and help them decide, as of now we are both trashing our reputations, as such an argument portrays us as children. I apologize for heightening this debate, if you wish to continue it, could we keep it off this thread?