Water cooling help

Solution
Budget first maybe?

H100i has good performance on par with some of the very large air coolers. The fans it comes with can be a bit noisy though.

Has Corsair Link software to control fan/pump speed and monitor all kinds of things. (When you can get it to work) It does occupy one of your USB headers on the motherboard to do so. Also offers the ability to control the color of the corsair logo on the pump.

All that said your case supports pretty much any CLC liquid cooler that has a 120, 140, 240, or 280mm radiator.
Budget first maybe?

H100i has good performance on par with some of the very large air coolers. The fans it comes with can be a bit noisy though.

Has Corsair Link software to control fan/pump speed and monitor all kinds of things. (When you can get it to work) It does occupy one of your USB headers on the motherboard to do so. Also offers the ability to control the color of the corsair logo on the pump.

All that said your case supports pretty much any CLC liquid cooler that has a 120, 140, 240, or 280mm radiator.
 
Solution
There is not a single CLC cooler built today that outperforms an equivalently priced air cooler. That being said I can't think of a single reason to get one..... they are typically 4 to 12 times as loud as a cheaper air cooler and can't deliver equivalent thermal performance. You said "best" w/o a budget limitation so we'll start there.

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That 68 dbA for the H100i is equivalent to a vacuum cleaner .... not a modern vacuum cleaner, I'm talking grandma's VC

There is an alternative in that is an exception but it is not a CLC and you can see that in the above image, and that's the Swiftech H220-X

1. The H100i is about 6x as loud as the H220-X
2. The H100i loses to the H220-X by 7C in thermal performance
3. The H100i is a closed loop system, the Swiftech is open loop meaning you can expand it and water cool MoBos, RAM or GFX cards and even add more radiators.
4. The H100i has an aluminum radiator, the H220-X is copper which is more thermally conductive
5. The H100i uses mixed metals which promoted galvanic corrosion, the H220-X is all copper / brass.
6. The H100i doesn't have a reservoir, the H220-X does.
7. You can not replace components in the H100i, the Swiftech you can ... all parts are simply individual components found in custom water cooling loops that are "pre-assembled" at the factory.

http://www.hitechlegion.com/reviews/cooling/liquid/40870-swiftech-h220-x-open-loop-240mm-cpu-cooler-review?showall=&start=3

....with a CLC you are limited to only what it is, and only the performance it can deliver as assembled. With that in mind, the H220X makes infinitely more sense as a starting point into liquid cooling. It is ready to go out of the box and requires no maintenance, but it is also fully expandable when you are ready to take the next step. Even if you aren’t looking to take the next step, the H220X outperforms every CLC on the market, and does it at more than 20 dB quieter. Plus, it actually looks like an open loop cooler, simply because it is one.

While the H220X is an obvious choice for the novice, it also has some incredible benefits for the enthusiast looking to do a smaller loop. When you break it down, the H220X is a collection of excellent components that simply happen to come in one box. The included Apogee XL is top notch, and recently took home a Hi Tech Legion Gold Award. The MCP30 pump has a head pressure of over 2 meters, with over 1GPM flow and PWM control, making it a perfect choice for a 3-4 component loop. The radiator is an excellent quality copper/brass piece that delivers excellent low rpm performance, and the attached reservoir is easily accessible. 3/8” ID tubing is used throughout, and there is plenty of length to simply make one cut to add a GPU in most builds. In other words, you have a small loop in a box with every component being top quality, and may be the same components you would have been looking at in the first place.

Installation of the H220X was very easy, probably the easiest liquid cooler I have ever done.... The PWM splitter is as easy as it gets, and takes absolutely all of the guesswork out of the wiring setup.

In terms of performance, well….we could simply leave it at the fact that the H220X is simply the best performing out-of-the-box cooler you can buy today. Period. It slightly betters its predecessor, the H220, as well as the Glacer 240L that is equipped with far more powerful and louder fans. The NZXT X60/61 comes close in terms of performance, but at the expense of far more noise and far less compatibility. 240mm CLCs can’t touch the H220X in all out performance, and at tolerable noise levels the H220X flat out embarrasses them. The Cryorig R1 and Noctua NH-D15 come closest in matching the H220X in terms of performance and noise, but fall short. What more can you say? We put the best out of the box solutions up against the H220X, and the H220X walked away a clear winner and did so with absolutely astonishing performance to noise. With all of this performance the H220X never topped 40 dB at full speed.

....The result of this redesign makes the H220X the best performing cooler that is install ready right out of the box. There is not a 240mm CLC or air cooler that can beat it, and it does it at 20+ dB quieter than the competing CLCs. To sum it up; the H220X offers better performance, lower noise, better aesthetics, flawless design and build, better components and the option of expandability when compared to a CLC. Putting it gently, choosing any CLC over the H220X would be doing yourself a huge disservice. If you are looking to step into liquid cooling, or looking to start a small loop, the H220X is the obvious choice and comes with our highest recommendation and Hi Tech Legion Editor’s Choice Award.

Ok, now let's talk budget:

At $30 there's the Hyper 212 air coolers and several imitators .... it competes with CLCs in it's price range outperformning many that cost twice as much

At $60 you have the Phanteks PH-TC14PE air cooler and it too outperforms any CLC in it's price range and most up to $100. To top the Phanteks a CLC needs to get above 2200 rpm bringing the associated fan noise with it.

At $90 you have the Noctua DH-15 and Cryorig R1 air cooler and they outperforms every CLC out there in its price range including the H100i

At $140 you have the 280mm Kraken X61, 360mm Thermaltake Water Ultimate and the Swiftech H220-X ... it's no contest.

Though, if this fits your budget....since your case will fit a 280mm rad, I'd suggest the big brother to the H220-X known as the H240-X for just $10 more.

http://www.hitechlegion.com/reviews/cooling/liquid/42047-swiftech-h240-x-open-loop-280mm-cpu-cooler-review?showall=&start=2

http://www.swiftech.com/