I'll weigh in here with my "unbalanced" experience.
I think I'll agree without much qualification to the comments of Tweakin and Krnmastersgt.
Even if you plan on overclocking, your platform and processor -- barring (perhaps) the X79 socket 2011 "E" processors -- should pretty much allow you to use either air or water. And even an appropriate air-cooler might allow for some overclocking in this latter category.
But if (I were) OCing your platform on air-cooling, I'd be inclined to pick a top-end heatpipe cooler.
If I were doing it on water-cooling, I think I'd skip the AIO coolers like the H100(I) and various competitors, and I would build a simple custom-loop, as Tweakin suggests.
The AiO or CLC coolers as they're called, seem to best the top-end air-coolers in benchmark reviews by maybe 10C to 14C degrees. There are ways to partly close that gap, because the reviews only consider the bundled stock fans, run-of-the-mill TIM greases, case cooling strategies (and without even low-tech enhancements). I'd pick "air" over these AiO coolers because there have been reports of failing pumps and hoses coming loose. The chances this would happen to you may fall well below 10% probability, but it is still worth thinking about, although I'm sure many people using these new AiO products will swear by them. Even so, I've seen some of those complain about noisy fans.
Here's another thought. Noctua is poised to release a new "double-tower" cooler next month (April) or shortly thereafter. For a heatsink base, they will deploy a composite of copper and nano-diamond, and they insist this increases the thermal conductivity of the base by 25% over the usual solid copper bases used by all extant heatpipe coolers.
Some players in the industry noted that they don't understand why waterblock manufacturers aren't all over this innovation like flies on a dead bunny, but if the cooler proves itself, that too will happen.
If the "so-called D15" Noctua proves out, it is possible it may equal or surpass these AiO coolers -- at least those now on the market. If Noctua has an exclusive patent on the heatsink base, their competitors may purchase a license to use it, or find an alternative. There are also some new coolers appearing which employ "phase change" with heatpipes or something similar to that description: like a common cavity inside the heatsink base.
On the new anticipated Noctua, nano-diamond doesn't cost all that much, and the manufacturing process may not be such an important cost factor to Noctua -- but demand may set the price. Even so, I'd think it unlikely that the cooler will cost more than an AiO/CLC water-cooling unit, and likely to also cost somewhat less than custom water kits.
So, as krnmastersgt said, you might spend the $30 for a CM Hyper 212 EVO now, then see what happens between next month and this summer.