I understand about where you are coming from with your build. you are looking for some thing unique that will play well use 3 monitors and last a bit. That brings the choices a bit more down and probably a huge drop in price. The i7 you chose is also a quad core cpu and will not do any better in games then the i5 2500k or the i5 3570k to be honest. In gaming more cores do not mean better performance. A dual core will game just as well as a quad but the quad will perform better. Most games do not even use dual cores as a requirement soa quad will suit for at least a few more years really well when it comes to gaming.
And most games mainly use your gpu to play every thing. So when gaming is concerned thats where i would concentrate on the build. It will be the brawn of your system so keep that in mind.Most of the newer cards and a lot of the high end ones support multiple monitors.
A good read.
A guide to Eyefinity
A sli/crossfire faq
So there is some good reading on the hook ups and how to's of Eyefinity as well as sli/crossfire. And worth the read to help bring you up to speed on things pretty quick. And it may help you in finding what you are looking for in a gpu.
That is a list of the gpu's that support the eyefinity are amd and are in the 7000 series (so latest newest gpus) They recommend at least 2 gigs of video ram for it. So i'll break down that huge list of cards down to the max they have.
2gb ($159.99 plus price tag)
3Gb ($299.99 plus price tag)
6gb (super expensive $599.99 plus price tag)
As for slots for coolers close to the ram slots? There are some boards made with this in mind and you can also get different sized coolers as well as low profile ram. So there is some play room here and there. Liquid cooling is mainly for extreme over clockers looking to push their systems to the max. But it comes at high risks and costs for very little jump in over all performance. They will see higher jumps in performance in games that utilize more cpu then gpu. But will see no gains hardly in games that utilize the gpu more over the cpu. In builds you want to keep several things in mind.
First what do you want your system to do. With this we know you want a good gaming fps system that can utilize 3 monitors at once.
Second is the costs to performance ratio. Keeping in mind you want your pc to do what you want and get the best parts for your system without over paying for parts that give very little gains.
Thirdly you want to consider your budget and your max cash. It will do you no good to pick out all these awesome new parts with noway to buy them.
With these things in mind you start out first with your cpu.
Note:If over clocking what cooler to use for your cpu as coolers that come with your cpu are designed to keep it cool under normal stress and wear and tear.
Second the motherboard you need to accomplish this goal.
Third you choose the card/cards needed to accomplish this.
Fourth with your motherboard now picked out choose the best ram for your pc.
Fifth your hdd/sdd (ssd are great for windows loading and game loading but the less you use an ssd the better and longer life span of it so a larger ssd is not always great and using it as little as possible is best as its life span is set to its read and writing)
Sixth thing you should look for is the optical drive that will suit your needs
Seventh is what psu will serve these needs and allow for a future upgrade.
Eighth Is your operating system (linux mac windows)
Ninth and final is your case keeping in mind all the other parts must fit into it as well as be able to keep these components cool.
Those are the steps i take for any build or build advise. And in that order. This allows for you to move some components up or down in price to fully suit your budget.
My concern with the case you chose is the cooling aspect. It has a fan on the top of your case which is good for less trapping at the top but it also only utilizes 3 fans. 1 on top 1 on the side and 1 on the back. In cases its best to either:
1.Move as much air in and fast to cool it down
2.Move as much air as possible out of the case as fast as possible
3.A combination of the 2 above with some fans pulling in air and some moving them out.
Some cases can create hot pockets of air that do not leave the case in either of the 3 options above and those are the ones to try to avoid. Some builders swear by full exhaust (pulling air out of the case as much as possible as fast as possible). And some swear by the full intake (all fans pulling air into the case as much and as fast as possible). And some love to create air circulation (an example would be fans on the front or side pulling air in while fans on the rear and top push it out).
It is impossible to say one is right or one is wrong. It depends on the person and their environment. If it stays pretty cool where yo live all year around then an intake system will suit you well (snowy type). If how ever you live in a hot area where it can get pretty hot then exhaust would probably be best (desert type environments). If it is some times hot and some times cool then a balance of the two may be best. Regardless cases are not 100% air tight. So with a full exhaust your case will still suck in some air and full intake will still push some air out.
So with those things in mind and which way you prefer it to work or need it to work you choose your case. You can also factor in that you may have central air or maybe air conditioning. Plus you need to factor in dust management on intake builds by using filters and cleaning your pc religiously with canned air for exhaust builds. And different cases are designed with different air flow in mind. Case cooling is important in almost all builds. And pc components do not like hot air very much at all. Also some cases offer cable management solutions to help keep your cables out of the way as well. Cases come in all shapes and sizes as well as offer different price ranges.
I hope this information can help you decide on your best parts and helps to give you a few more small parts to read up on. Putting a pc together is not really hard. The hardest part is to wade through all the components to find a balance between what you need/want and what you can afford. But once it is built you not only feel pride but also a feeling of accomplishment. As you not only chose the parts but you also built it yourself. It has a learning curve but you are already well on your way