Best $1500 Build (Including Windows 10 and monitor)

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PCPartPicker part list / Price breakdown by merchant

CPU: AMD Ryzen 5 1500X 3.5GHz Quad-Core Processor ($188.98 @ NCIX US)
Motherboard: ASRock AB350M Pro4 Micro ATX AM4 Motherboard ($77.98 @ Newegg)
Memory: Team Vulcan 16GB (2 x 8GB) DDR4-2400 Memory ($94.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($47.66 @ OutletPC)
Video Card: Gigabyte GeForce GTX 1080 Ti 11GB Gaming OC 11G Video Card ($684.79 @ SuperBiiz)
Case: Corsair Carbide Series 88R MicroATX Mid Tower Case ($49.99 @ Corsair)
Power Supply: SeaSonic S12II 520W 80+ Bronze Certified ATX Power Supply ($44.89 @ Newegg)
Operating System: Microsoft Windows 10 Home OEM 64-bit ($86.88 @ OutletPC)
Monitor: Acer XF240H 24.0" 1920x1080 144Hz Monitor ($239.99 @ SuperBiiz)
Total: $1516.15
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-05-03 06:18 EDT-0400
 
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PCPartPicker part list / Price breakdown by merchant

CPU: AMD Ryzen 5 1600 3.2GHz 6-Core Processor ($217.55 @ OutletPC)
Motherboard: Gigabyte GA-AB350-GAMING 3 ATX AM4 Motherboard ($109.49 @ SuperBiiz)
Memory: Team T-Force / Night Hawk 16GB (2 x 8GB) DDR4-3000 Memory ($104.99 @ Newegg)
Storage: Kingston HyperX Fury 240GB 2.5" Solid State Drive ($80.99 @ Amazon)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($47.66 @ OutletPC)
Video Card: XFX Radeon RX 480 8GB GTR Video Card ($224.99 @ Newegg)
Case: NZXT S340 (Black/Red) ATX Mid Tower Case ($61.99 @ Newegg)
Power Supply: EVGA SuperNOVA G3 550W 80+ Gold Certified Fully-Modular ATX Power Supply ($69.99 @ Newegg)
Operating System: Microsoft Windows 10 Home OEM 64-bit ($86.88 @ OutletPC)
Monitor: LG 25UM58-P 25.0" 2560x1080 75Hz Monitor ($164.99 @ Amazon)
Total: $1169.52
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-05-03 05:20 EDT-0400

overclock the monitor to 75hz and use radeon chill to cap fps @ 75.
i have played Dota 2 in an ultrawide, should say that u can see more map area and is definitely a better experience. good for mmo, open world games.