I made a pcpartpicker list

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List looks good to me.

While the AIO wouldn't be used at it's fullest performance, i'd say keep it since it gives quite a bit eyecandy, especially when you love seeing AIO in your PC.

As far as RAM goes, 4x 4GB has a bit better performance than 2x 8GB,
comparison: http://ram.userbenchmark.com/Compare/HyperX-Fury-DDR4-2400-C15-2x8GB-vs-HyperX-Fury-DDR4-2400-C15-4x4GB/3587vs3585

But the best part is that for eyecandy, 4x RAM sticks look way better than 2x RAM sticks with 2x RAM slots free. In my Skylake build (full specs with pics in my sig), i too have 4x 4GB Kingston RAM sticks but mine isn't Fury series but instead Savage series and 3000 Mhz ones. Here's a pic of them too to see how they look when installed (click on spoiler to...

mcconkeymike

Distinguished
I agree that water cooling is unnecessary with a locked CPU. Something like the 212 EVO would be more than enough to cool it. Also, yes 2x8 is a better way to go with RAM. A traditional hard drive would be a good addition, but not completely necessary. When you look for the PSU, try to find a quality gold rated one with that high end of parts you'll be glad you did.
 
For those saying why the Z series motherboards, because the Hxxx or Bxxx series have not been released yet. He has no other choice.

Drop the liquid cooler, go with the stock cooler or Cryorig one. You cannot overclock the 8700 anyway.

4 x 4GB? Overkill, but if you are going for aesthetics then nothing to do I guess. I would still go for 2 x 8.

PSU is not listed, but go for a 650W or higher, with 80+ Gold and from a good brand. like Seasonic.

Case is a bit shady, I have heard some stories on it, but it looks good. Be careful.

 

Aeacus

Titan
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List looks good to me.

While the AIO wouldn't be used at it's fullest performance, i'd say keep it since it gives quite a bit eyecandy, especially when you love seeing AIO in your PC.

As far as RAM goes, 4x 4GB has a bit better performance than 2x 8GB,
comparison: http://ram.userbenchmark.com/Compare/HyperX-Fury-DDR4-2400-C15-2x8GB-vs-HyperX-Fury-DDR4-2400-C15-4x4GB/3587vs3585

But the best part is that for eyecandy, 4x RAM sticks look way better than 2x RAM sticks with 2x RAM slots free. In my Skylake build (full specs with pics in my sig), i too have 4x 4GB Kingston RAM sticks but mine isn't Fury series but instead Savage series and 3000 Mhz ones. Here's a pic of them too to see how they look when installed (click on spoiler to view):
SeM5f5R.jpg
As far as any additional components go, add a top-of-the-line 600W range PSU and you're golden. E.g Seasonic PRIME 650 80+ Titanium which is the best 650W PSU money can buy at current date.

With Seasonic PRIME 80+ Titanium series, you'll get the highest efficiency (94%), tightest voltage regulation (0.5%), longest hold-up time (30ms), lowest ripple noise (20mV) and longest warranty (12 years) there is. Fully modular cables and toggle-able Premium Hybrid fan control too.
specs: https://seasonic.com/prime-titanium
review: http://www.tomshardware.com/reviews/seasonic-prime-titanium-650w-psu,4690.html
pcpp: https://ca.pcpartpicker.com/product/nn648d/seasonic-prime-650w-80-titanium-certified-fully-modular-atx-power-supply-ssr-650td

My Skylake build is also powered by PRIME 650 80+ Titanium PSU.
Oh, all semi- and fully-modular Seasonic PSUs are also compatible with CableMod SE-series custom sleeved power cables. To match my Skylake's black & red theme and Haswell's black & blue theme, i have replaced the stock black power cables with CableMod SE-series custom sleeved power cables (red colored for Skylake and blue colored for Haswell).
cablemod: https://cablemod.com/products/?filter_series=se-series&show_products=48
 
Solution

Aeacus

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You don't like real world performance comparison and prefer synthetic benchmark sites by saying UserBenchmark is a site i wouldn't want to quote?

While it is true that 4x RAM sticks put a bit higher load on memory controller, all MoBos that have 4x RAM slots are able to withstand when all the RAM slots are populated with ease. Else-ways there wouldn't be 4x RAM slots on a MoBo.

While 2x sticks can give a bit better CPU OC overhead compared to the 4x sticks, OP's build has non-K CPU in it which makes that small benefit useless.

Also, what's your source about better performance with 2x 8GB rather than 4x 4GB? I'd like to read/watch it.

As far as my source goes and if you don't take the UserBenchmark as reasonable proof, how about video comparison between 4x 4GB, 2x 8GB and 1x 16GB?
youtube: https://www.youtube.com/watch?v=BgQEG8RC9HE

It's seen from that video that 4x 4GB, at times, has better performance (FPS wise) than 2x 8GB since having many smaller sticks gives better RAM access speed than having few bigger sticks.

@OP
Thermaltake Smart series PSU is low quality unit and i'd return it back to the store. Mainly because of the poor build quality but also because fully-wired PSU gives you a nice headache in cable management. Any fully-modular Seasonic unit in 600W range would be much better choice, e.g M12II-620 EVO, G-650, Focus+ 650 or PRIME 650 80+ Titanium,
pcpp: https://ca.pcpartpicker.com/products/compare/WrNypg,Tc3RsY,R7V48d,nn648d/

M12II EVO and G series PSUs come with 5 years of OEM warranty. (My Haswell build is also powered by M12II EVO series PSU.)
Focus+ is the newest PSU line from Seasonic and it comes with 10 years of OEM warranty.
And you know about PRIME series already since i covered that in my earlier reply.
 

maxalge

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you do realize userbenchmark is a synthetic benchmark yes?

and youtube is also something you dont want to be using for serious talks about tech either

you would be hard pressed to find a more wretched hive of scum and villainy XD

the better performance on the dual sticks comes from tighter timings and higher OC potential
 

Aeacus

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Don't know from where you take your info about timings between 4GB and 8GB sticks since you don't want to put out any proof. And frankly, i don't take your word for it. Instead, it's well known fact that smaller capacity sticks actually have tighter timings than their bigger capacity counterparts.

Example: RAM selected by OP, 4x 4GB Kingston HyperX Fury 2666 Mhz, has:
JEDEC/PnP: DDR4-2666 CL15-17-17 @1.2V
JEDEC/PnP: DDR4-2400 CL14-16-16 @1.2V
JEDEC/PnP: DDR4-2133 CL12-14-14 @1.2V
XMP Profile #1: DDR4-2666 CL15-17-17 @1.2V
specs: https://www.kingston.com/dataSheets/HX426C15FBK4_16.pdf

While 2x 8GB Kingston HyperX Fury 2666 Mhz has:
JEDEC/PnP: DDR4-2666 CL16-18-18 @1.2V
XMP Profile #1: DDR4-2666 CL16-18-18 @1.2V
specs: https://www.kingston.com/dataSheets/HX426C16FB2K2_16.pdf

And just because there's higher OC potential doesn't mean that it actually works. Potential is something that "can be" achieved not something that "will be" achieved.

@OP
Since the main thing you like to have is eyecandy, 4x RAM sticks will look better in the system than 2x RAM sticks. Also, i don't think you would upgrade your RAM in the future to 32GB if you go with 2x 8GB now. That, and there's also a chance that the additional 2x 8GB RAM kit you add at later date doesn't work even if both sets of 2x 8GB are identical. To get all 4x RAM sticks working on the MoBo, you'd be better off going with 4x stick set rather than getting 2x stick set now and another 2x stick set later on.
Performance wise, you can't tell a difference between 4x 4GB and 2x 8GB since the gap between them is so small.