New Build -- Need advice on Monitor and Case -- other advice welcome, too.

###Build Help/Ready:

Have you read the sidebar and rules? (Please do)

Yes

What is your intended use for this build? The more details the better.

Will use this for gaming/streaming mostly. But also will be used for 3d rendering in blender and my Unity 3d projects.

If gaming, what kind of performance are you looking for? (Screen resolution, framerate, game settings)

For gaming I would like to have gsync and at the UltraWide resolution of 3440x1440 (1440p) at the highest refresh possible on the main monitor. I will have two other (existing) 24 inch monitors hooked up and vertical to expand my work space.

What is your budget (ballpark is okay)?

Soft cap at 3,000.

In what country are you purchasing your parts?

US

Post a draft of your potential build here (specific parts please). Consider formatting your parts list. Don't ask to be spoonfed a build (read the rules!).

PCPartPicker part list / Price breakdown by merchant

Type	Item	Price
CPU	Intel - Core i7-8700K 3.7GHz 6-Core Processor	$338.89 @ OutletPC
CPU Cooler	Corsair - H100i v2 70.7 CFM Liquid CPU Cooler	$104.89 @ OutletPC
Motherboard	EVGA - Z370 Classified K ATX LGA1151 Motherboard	$278.58 @ Newegg
Memory	G.Skill - Trident Z 16GB (2 x 8GB) DDR4-4133 Memory	$260.99 @ Newegg
Memory	G.Skill - Trident Z 16GB (2 x 8GB) DDR4-4133 Memory	$260.99 @ Newegg
Storage	Samsung - 960 EVO 500GB M.2-2280 Solid State Drive	$199.89 @ OutletPC
Storage	Western Digital - Caviar Black 4TB 3.5" 7200RPM Internal Hard Drive	$183.45 @ OutletPC
Video Card	EVGA - GeForce GTX 1080 Ti 11GB FTW3 GAMING iCX Video Card	$1377.79 @ OutletPC
Power Supply	EVGA - SuperNOVA G2 850W 80+ Gold Certified Fully-Modular ATX Power Supply	$159.89 @ OutletPC
Monitor	Acer - Predator X34 34.0" 3440x1440 100Hz Monitor	$996.00 @ Amazon
Monitor	Asus - ROG SWIFT PG348Q 34.0" 3440x1440 100Hz Monitor	$1177.00 @ Amazon
Monitor	AOC - AG352UCG 35.0" 3440x1440 100Hz Monitor	$899.99 @ Best Buy
Monitor	Acer - Predator Z35P 35.0" 3440x1440 100Hz Monitor	$1040.00 @ Newegg
Monitor	Acer - Predator X34 34.0" 3440x1440 100Hz Monitor	$1099.99 @ Amazon
Prices include shipping, taxes, rebates, and discounts
Total (before mail-in rebates)	$8398.34
Mail-in rebates	-$20.00
Total	$8378.34
Generated by PCPartPicker 2018-03-12 17:21 EDT-0400

Provide any additional details you wish below.

I already bought the video card today since they are ridiculously hard to come by. As you can probably tell, I am partial to eVGA because they have always done right by me.

The main advice I am looking for is on the monitor and the case. For the monitor, this is my first Ultrawide and I am super excited about it. I will have a 1080ti so I would like to take advantage of g-sync and a high refresh rate. I added 5 of the ultrawides I have been looking at to the build. I will only be buying one. The monitor I am looking for is the UPDATED version of the Predator x34 that has a refresh rate which overclocks to 120hz.

For the case, I would like something that looks nice with a window and has easy easy cable management. I am terrible at cable management.

Other advice on the build would be appreciated, like if I have overkill anywhere or need to upgrade/downgrade anything. And also, please let me know if I am missing anything obvious. This is my first build in a while.

NOTE: You do not have to follow this format, but please be sure to answer these questions. Please do not ask to simply be given a build. You are welcome to delete this section.