It looks like you have well researched your choices and on;y have really 2 areas of concern.
a) I'd strongly recommend against the h100i or any CLC for that matter.
b) You need storage beyond the SSD
The rest I am just offering for considering as the nature of these types of posts, fall into the 'this is what I am thinking but perhaps there are better options I might consider category". So this is what Id think about before pulling the trigger
1. Depending on "how much" video editing, if budget is an issue, consider the i5 if its only a very rare thing on the editing. If it was me, I'd spring for the i7. Also, if not in a rush and willing to wait til say April, Id consider Z270 / Kaby Lake 7700k build.
2. I simply can not recommend the h100i even if it was free (or any CLC for that matter)... it's noise level is horrendous ... it can not cool as well as a $80 air cooler and to even get close it has to be
12 times as loud. See 17:00 mark.
https://www.youtube.com/watch?v=TivNOgQqW-M
If you want to listen for yaself ... I'd have to leave the room at 55% CPU load...the noise would drive me nuts.
https://youtu.be/cTf0Vq1j4Ec
The weak pump and cheap aluminum radiator just can't move enough heat for CLCs to compete with the better air cooler w/o using extreme speed / noisy fans. If you want water, look at the Swiftech H220 X2 / H240 X2
http://www.swiftech.com/aio.aspx
3. I recent months the number of extremely negative reviews on Z170 boards has skyrocketed across the board.
https://www.newegg.com/Product/Product.aspx?Item=9SIA4S844G6223
Here we see just 40% giving the Hero 5 eggs and 20% giving it the extremely dissatisfied 1 egger rating. However, the Gigabyte Gaming 7 .... 6 time customer choice award winner isn't a whole heckuva lot better ... I look for > 50% 5 eggs and , < 20% 1 eggs and the Gaming 7 just barely makes the cut at 51% / 19%. we have had issues with our last 3 Hero builds but I can't rely on that as it's statistically insignificant. So only advice here is look around b4 making a decision. Feature wise ...
The Giga ...
supports faster memory
has extra M.2 slot
has more SATA Express ports
has 2nd LAN port (w/ built in anti-surge)
has 3 more USB 3 ports
has 1 less chassis fan header (3 vs 4)
cost significantly less
4. Be aware of the voltage concers on RAM above 3200 ... lotta peeps are spooked by the extra RAM voltage required. You will see a lot of "ooh scary scary" posts about using anything above 1.2v. To my eyes, if Intel says its OK (and they do), it's OK. There is a big price jump above 3200 ... as well as more work getting it to run stable so just be aware of those walking in.
As for the amount, 32 GB wouldn't hurt for the video editing ... again if this will be a significant part of your usage and i expect from you post that it is not. If that's the case, I'd stick w/ 16 GB. Either way keep it above DDR4-3200
5. HX 850 is a great PSU ... but there are other great ones that are less costly ... is future SLI in the picture ? If not, Id get smaller. Right now the best PSUs on the market are the Seasonic prime series ... can't say anything bad about the HX, just throwin it out there in case ya wanna comparison shop. There's also a 750 and 850 watter.
SeaSonic PRIME 650W ($150)
http://pcpartpicker.com/product/nn648d/seasonic-prime-650w-80-titanium-certified-fully-modular-atx-power-supply-ssr-650td
6. The 1080 Ti has been ready since late 2016 ... nVidias holding it till AMD drops their cards (expected 2nd quarter) .. so if ya willing to wait, that would be the way to go. By that time you also might want to consider the Z270 Boards w/ Kaby Lake
7. Case choice is generally / primarily a aesthetics thing ... so only have two things to consider here:
a) a $99 case is a bit outta place in a $2k build.
b) If performance matters, tweaktown ranks the case:
http://www.tweaktown.com/reviews/5607/nzxt-phantom-530-mid-tower-chassis-review/index8.html
performance 93%
quality 98%
features 96%
bundle 95%
value 95%
c) In that vein I'd consider Enthoo Luxe (has a tempered glass version also)
http://www.tweaktown.com/reviews/6574/phanteks-enthoo-luxe-full-tower-chassis-review/index8.html
performance 100%
quality 99%
features 100%
bundle 98%
value 100%
and the Evolv Tempered Glass which "belongs in an art gallery". The case won "Case of the year 9w/o th glass) and is widely regarded as the best case available today < $200
http://www.tweaktown.com/news/49624/tempered-glass-phanteks-enthoo-evolv-atx-belongs-art-gallery/index.html
https://www.youtube.com/watch?v=GKUkj23GgFE
https://www.youtube.com/results?search_query=evolv+tempered+glass
8. The SSD will presumably contain your OS, utilities and applications ... that's say 165 GB. At that point GTAV won't fit....Witcher 3 , with DLCs and Expansions is iffy. The 250 GB only holds 232 GB of files. We have not used a HD in almost 7 years. After testing when they first came out, we found that SSHDs excel for both workstation and gaming scenarios. You see that they top the charts in the link below, being 50% faster than the WD Black and w/ a 5 year warranty.
Gaming
http://www.tomshardware.com/charts/hdd-charts-2013/-17-PCMark-7-Gaming,2915.html
Video Editing
http://www.tomshardware.com/charts/hdd-charts-2013/-13-PCMark-7-Video-editing-using-Windows-Movie-Maker,2911.html
http://pcpartpicker.com/product/NpBrxr/seagate-firecuda-2tb-35-7200rpm-hybrid-internal-hard-drive-st2000dx002
Again, the only real issue I have is the cooler ... the H100i does not cool as well as the Noctua NH-D15 air cooler and is 12 times as loud.... the H100i doesn't cool neat as well as the Swiftech and is 6 times as loud. The extra storage is not essential immediately, you have some time to make hat decision
Other than not, the others are just something ya might want to look at before pulling the trigger.
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