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Is there anything I can downgrade?

Solution
This is a more complete listing for the system, including the cheapest GTX1070 I could find and a 144Hz 1440 display:

PCPartPicker part list / Price breakdown by merchant

CPU: AMD - Ryzen 5 1600 3.2GHz 6-Core Processor ($183.39 @ SuperBiiz)
Motherboard: MSI - B350 PC MATE ATX AM4 Motherboard ($65.88 @ OutletPC)
Memory: Team - Vulcan 16GB (2 x 8GB) DDR4-3000 Memory ($184.99 @ Newegg)
Storage: Seagate - BarraCuda 1TB 3.5" 7200RPM Internal Hard Drive ($44.89 @ OutletPC)
Video Card: NVIDIA - GeForce GTX 1070 8GB Video Card ($429.99 @ Best Buy)
Case: NZXT - S340 (Black/Red) ATX Mid Tower Case ($64.99 @ SuperBiiz)
Power...
Changed CPU, Case, RAM & added in a SSD (Kept Black/Red Theme).

PCPartPicker part list / Price breakdown by merchant

CPU: Intel - Core i3-8350K 4.0GHz Quad-Core Processor ($168.99 @ SuperBiiz)
CPU Cooler: Cooler Master - Hyper 212 LED 66.3 CFM Rifle Bearing CPU Cooler ($19.99 @ Newegg)
Motherboard: MSI - Z370 GAMING PLUS ATX LGA1151 Motherboard ($111.98 @ Newegg)
Memory: G.Skill - FORTIS 16GB (2 x 8GB) DDR4-2400 Memory ($159.99 @ Newegg)
Storage: Crucial - MX300 275GB M.2-2280 Solid State Drive ($89.99 @ Amazon)
Storage: Seagate - Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($59.99 @ Adorama)
Video Card: Asus - GeForce GTX 1070 8GB Video Card
Case: Deepcool - TESSERACT SW RED ATX Mid Tower Case ($40.99 @ SuperBiiz)
Power Supply: Corsair - CXM 550W 80+ Bronze Certified Semi-Modular ATX Power Supply ($54.99 @ Amazon)
Operating System: Microsoft - Windows 10 Home Full 32/64-bit ($109.99 @ B&H)
Monitor: AOC - G2460PF 24.0" 1920x1080 144Hz Monitor ($204.99 @ Amazon)
Total: $1021.89
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-01-26 13:50 EST-0500
 


At least get a 8400 for a tad more.
 


 
This is a more complete listing for the system, including the cheapest GTX1070 I could find and a 144Hz 1440 display:

PCPartPicker part list / Price breakdown by merchant

CPU: AMD - Ryzen 5 1600 3.2GHz 6-Core Processor ($183.39 @ SuperBiiz)
Motherboard: MSI - B350 PC MATE ATX AM4 Motherboard ($65.88 @ OutletPC)
Memory: Team - Vulcan 16GB (2 x 8GB) DDR4-3000 Memory ($184.99 @ Newegg)
Storage: Seagate - BarraCuda 1TB 3.5" 7200RPM Internal Hard Drive ($44.89 @ OutletPC)
Video Card: NVIDIA - GeForce GTX 1070 8GB Video Card ($429.99 @ Best Buy)
Case: NZXT - S340 (Black/Red) ATX Mid Tower Case ($64.99 @ SuperBiiz)
Power Supply: SeaSonic - 520W 80+ Bronze Certified Fully-Modular ATX Power Supply ($49.99 @ SuperBiiz)
Operating System: Microsoft - Windows 10 Home Full 32/64-bit ($109.99 @ B&H)
Monitor: Acer - XG270HU 27.0" 2560x1440 144Hz Monitor ($363.95 @ Adorama)
Total: $1498.06
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-01-27 06:33 EST-0500

This is what it looks like with no GPU and the 1080 AOC monitor used previously:

PCPartPicker part list / Price breakdown by merchant

CPU: AMD - Ryzen 5 1600 3.2GHz 6-Core Processor ($183.39 @ SuperBiiz)
Motherboard: MSI - B350 PC MATE ATX AM4 Motherboard ($65.88 @ OutletPC)
Memory: Team - Vulcan 16GB (2 x 8GB) DDR4-3000 Memory ($184.99 @ Newegg)
Storage: Seagate - BarraCuda 1TB 3.5" 7200RPM Internal Hard Drive ($44.89 @ OutletPC)
Case: NZXT - S340 (Black/Red) ATX Mid Tower Case ($64.99 @ SuperBiiz)
Power Supply: SeaSonic - 520W 80+ Bronze Certified Fully-Modular ATX Power Supply ($49.99 @ SuperBiiz)
Operating System: Microsoft - Windows 10 Home Full 32/64-bit ($109.99 @ B&H)
Monitor: AOC - G2460PF 24.0" 1920x1080 144Hz Monitor ($204.99 @ Amazon)
Total: $909.11
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-01-27 06:42 EST-0500

At 1440 rez the Ryzen 1600 I've chosen comes very close to Intels offerings: https://www.techpowerup.com/reviews/Intel/Core_i3_8350K/ but if you check the 1080 numbers you'll see Intel is a better choice if you're after maximum frame rates.

Some notes:
Really the monitor choice is key here.

At 1080 rez you want to go Intel for maximum frame rates or you can sacrifice some performance and cut the bill by opting for the R5 1600.

At 1440 rez the call is far closer, with the cheaper R5 1600 right behind the more expensive Intel parts, the downside is that a higher rez display costs more so what you save going for an AMD build will be spent on the monitor.

Neither build has a SSD for reasons of cost cutting but I'd really advise that one is included in the final build-whatever it is-they make the whole machine feel faster and more responsive.
 
Solution