Is this build optimal?

mmm... I'm not sure I would go this way with the build.

Are you aiming for silence? are you aiming for a gaming machine? productivity? Why mATX? The power supply isn't great either. those EVGA NEX units are the lowest quality devices EVGA produces. (the gold rating does not mean it's quality, just that it hits certain efficiency numbers)

If I was to do the build it probably would be a bit different. But first I'd like your answers to those questions.

PCPartPicker part list: https://pcpartpicker.com/list/fyFxNN
Price breakdown by merchant: https://pcpartpicker.com/list/fyFxNN/by_merchant/

CPU: Intel Core i7-7700K 4.2GHz Quad-Core Processor ($338.89 @ SuperBiiz)
CPU Cooler: CRYORIG H7 49.0 CFM CPU Cooler ($34.99 @ Amazon)
Motherboard: MSI Z270M MORTAR Micro ATX LGA1151 Motherboard ($119.99 @ B&H)
Memory: Corsair Vengeance LED 16GB (2 x 8GB) DDR4-3200 Memory ($129.99 @ Amazon)
Storage: Samsung 960 Evo 250GB M.2-2280 Solid State Drive ($129.99 @ B&H)
Video Card: Asus GeForce GTX 1070 8GB STRIX Video Card ($413.98 @ Newegg)
Case: NZXT S340 (Black/Red) ATX Mid Tower Case ($66.99 @ NCIX US)
Power Supply: EVGA SuperNOVA G2 550W 80+ Gold Certified Fully-Modular ATX Power Supply ($78.89 @ OutletPC)
Operating System: Microsoft Windows 10 Home OEM 64-bit ($88.58 @ OutletPC)
Monitor: Asus VE278H 27.0" 1920x1080 Monitor ($164.04 @ Amazon)
Keyboard: Cooler Master Lite L Wired Gaming Keyboard w/Optical Mouse ($44.99 @ NCIX US)
Total: $1611.32
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-03-04 02:58 EST-0500

Changed to a G2 PSU, NEX is not the lowest quality that EVGA makes however it is on the lower end of things. G2 line is far better for essentially the same price point.

Swapped the 1080 for a 1070 strix card as you're only shooting for 1080p.

Took out the industrial fans because the fans that come with the case will be just fine, and swapped the low profile cooler for a larger cooler.

I would also like to point out, that while you are shooting for a beast build, you are going over budget because you want the build to look nice. Which is understandable, but if you take look out of the equation or at least have it take a back seat:

PCPartPicker part list: https://pcpartpicker.com/list/gDwjhq
Price breakdown by merchant: https://pcpartpicker.com/list/gDwjhq/by_merchant/

CPU: Intel Core i7-7700K 4.2GHz Quad-Core Processor ($338.89 @ SuperBiiz)
CPU Cooler: CRYORIG H7 49.0 CFM CPU Cooler ($34.99 @ Amazon)
Motherboard: MSI Z270M MORTAR Micro ATX LGA1151 Motherboard ($119.99 @ B&H)
Memory: G.Skill Ripjaws V Series 16GB (2 x 8GB) DDR4-2666 Memory ($94.99 @ Newegg)
Storage: Samsung 850 EVO-Series 250GB 2.5" Solid State Drive ($97.88 @ OutletPC)
Video Card: EVGA GeForce GTX 1070 8GB SC GAMING ACX 3.0 Black Edition Video Card ($374.00 @ Amazon)
Case: NZXT S340 (Black/Red) ATX Mid Tower Case ($66.99 @ NCIX US)
Power Supply: EVGA SuperNOVA G2 550W 80+ Gold Certified Fully-Modular ATX Power Supply ($78.89 @ OutletPC)
Operating System: Microsoft Windows 10 Home OEM 64-bit ($88.58 @ OutletPC)
Monitor: Asus VE278H 27.0" 1920x1080 Monitor ($164.04 @ Amazon)
Keyboard: Cooler Master Lite L Wired Gaming Keyboard w/Optical Mouse ($44.99 @ NCIX US)
Total: $1504.23
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-03-04 03:07 EST-0500

You can easily have it come down to the original price point of $1500.

If I was to build it this is how I'd tweak it. Of course I built it like I would build it (color matching parts), with trusted manufacturers and cost cutting where it makes sense. I downgraded the size of the monitor because in my experience 1080p looks good up to 24", past that and unless you're keeping the monitor 3'+ away getting anything larger will degrade your experience. For similar reasons I backed the GPU down to a 1070 and the cpu down to an i5 (frankly I could have backed it down to a 1060) because pairing an i7 and 1080 up on a 1080p 60hz monitor is a waste of money. those are the type of parts you get for a 2k or 3 monitor setup.



PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-7600K 3.8GHz Quad-Core Processor ($238.75 @ SuperBiiz)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($24.88 @ OutletPC)
Motherboard: MSI Z170A GAMING M5 ATX LGA1151 Motherboard ($154.88 @ OutletPC)
Memory: G.Skill TridentZ Series 16GB (2 x 8GB) DDR4-3200 Memory ($144.89 @ OutletPC)
Storage: Samsung 850 EVO-Series 250GB 2.5" Solid State Drive ($97.88 @ OutletPC)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($49.33 @ OutletPC)
Video Card: MSI GeForce GTX 1070 8GB Video Card ($414.99 @ B&H)
Case: NZXT S340 (Black/Red) ATX Mid Tower Case ($66.99 @ NCIX US)
Power Supply: EVGA SuperNOVA G2 750W 80+ Gold Certified Fully-Modular ATX Power Supply ($99.88 @ OutletPC)
Operating System: Microsoft Windows 10 Home OEM 64-bit ($88.58 @ OutletPC)
Case Fan: Corsair Air Series AF140 Quiet Edition 67.8 CFM 140mm Fan ($17.88 @ OutletPC)
Case Fan: Corsair Air Series AF140 Quiet Edition 67.8 CFM 140mm Fan ($17.88 @ OutletPC)
Monitor: Asus VX248H 24.0" 1920x1080 60Hz Monitor ($134.99 @ Amazon)
Keyboard: Cooler Master Lite L Wired Gaming Keyboard w/Optical Mouse ($44.99 @ NCIX US)
Total: $1596.79
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-03-04 03:27 EST-0500