Case and Motherboard needed!

Solution
Something like this then. RX 560 should let you make use of the freesync on that monitor. The only way I could get under $700 was to switch to a Pentium G4560 but I'm not sure how hard Fortnite hits the CPU. PCPartPicker part list / Price breakdown by merchant

CPU: AMD - Ryzen 3 2200G 3.5GHz Quad-Core Processor ($94.99 @ Amazon)
Motherboard: ASRock - AB350M Pro4 Micro ATX AM4 Motherboard ($59.99 @ Newegg)
Memory: GeIL - EVO POTENZA 8GB (2 x 4GB) DDR4-2400 Memory ($77.99 @ Newegg)
Storage: Samsung - 850 EVO-Series 250GB 2.5" Solid State Drive
Storage: Hitachi - 1TB 3.5" 7200RPM Internal Hard Drive ($37.50 @ Amazon)
Video Card:...
Something like this then. RX 560 should let you make use of the freesync on that monitor. The only way I could get under $700 was to switch to a Pentium G4560 but I'm not sure how hard Fortnite hits the CPU. PCPartPicker part list / Price breakdown by merchant

CPU: AMD - Ryzen 3 2200G 3.5GHz Quad-Core Processor ($94.99 @ Amazon)
Motherboard: ASRock - AB350M Pro4 Micro ATX AM4 Motherboard ($59.99 @ Newegg)
Memory: GeIL - EVO POTENZA 8GB (2 x 4GB) DDR4-2400 Memory ($77.99 @ Newegg)
Storage: Samsung - 850 EVO-Series 250GB 2.5" Solid State Drive
Storage: Hitachi - 1TB 3.5" 7200RPM Internal Hard Drive ($37.50 @ Amazon)
Video Card: MSI - Radeon RX 560 - 1024 4GB AERO ITX Video Card ($158.98 @ Newegg)
Case: Thermaltake - Versa H15 MicroATX Mid Tower Case ($29.92 @ Amazon)
Power Supply: Corsair - CX (2017) 450W 80+ Bronze Certified ATX Power Supply ($39.99 @ Amazon)
Operating System: Microsoft - Windows 10 Home OEM 64-bit ($99.99 @ Amazon)
Monitor: AOC - G2260VWQ6 21.5" 1920x1080 75Hz Monitor ($109.99 @ Newegg Business)
Total: $709.34
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-05-21 18:18 EDT-0400
 
Solution