This is a little over $2500, but it comes with a good monitor and it would game like a beast.
PCPartPicker part list:
https://pcpartpicker.com/list/P6n4KZ
Price breakdown by merchant: https://pcpartpicker.com/list/P6n4KZ/by_merchant/
CPU: Intel - Core i5-8600K 3.6GHz 6-Core Processor ($295.99 @ B&H)
CPU Cooler: CRYORIG - H5 Ultimate 76.0 CFM CPU Cooler ($46.88 @ OutletPC)
Motherboard: Gigabyte - Z370 AORUS Gaming 5 (rev. 1.0) ATX LGA1151 Motherboard ($151.98 @ Newegg)
Memory: ADATA - XPG GAMMIX D10 16GB (2 x 8GB) DDR4-2666 Memory ($145.99 @ Newegg)
Storage: Samsung - 850 EVO-Series 500GB 2.5" Solid State Drive ($139.95 @ Newegg Marketplace)
Storage: Seagate - Barracuda 3TB 3.5" 7200RPM Internal Hard Drive ($74.09 @ Newegg Marketplace)
Video Card: EVGA - GeForce GTX 1080 Ti 11GB SC Black Edition Video Card ($743.88 @ OutletPC)
Case: Phanteks - ECLIPSE P400 TEMPERED GLASS ATX Mid Tower Case ($79.99 @ Amazon)
Power Supply: SeaSonic - FOCUS Plus Gold 650W 80+ Gold Certified Fully-Modular ATX Power Supply ($83.99 @ SuperBiiz)
Monitor: AOC - AG352UCG 35.0" 3440x1440 100Hz Monitor ($899.99 @ Best Buy)
Total: $2662.73
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-12-07 11:56 EST-0500
This is under $2500, but you sacrifice storage and a few premium parts to keep it under budget.
PCPartPicker part list:
https://pcpartpicker.com/list/CWYCf8
Price breakdown by merchant: https://pcpartpicker.com/list/CWYCf8/by_merchant/
CPU: Intel - Core i5-8600K 3.6GHz 6-Core Processor ($295.99 @ B&H)
CPU Cooler: CRYORIG - H7 49.0 CFM CPU Cooler ($27.90 @ Newegg Marketplace)
Motherboard: Gigabyte - Z370 AORUS Ultra Gaming (rev. 1.0) ATX LGA1151 Motherboard ($119.98 @ Newegg)
Memory: ADATA - XPG GAMMIX D10 16GB (2 x 8GB) DDR4-2666 Memory ($145.99 @ Newegg)
Storage: Samsung - 850 EVO-Series 250GB 2.5" Solid State Drive ($89.99 @ B&H)
Storage: Toshiba - P300 1TB 3.5" 7200RPM Internal Hard Drive ($39.88 @ Other World Computing)
Video Card: EVGA - GeForce GTX 1080 Ti 11GB SC Black Edition Video Card ($743.88 @ OutletPC)
Case: Phanteks - Eclipse P300 Tempered Glass ATX Mid Tower Case ($49.99 @ Newegg)
Power Supply: SeaSonic - FOCUS Plus Gold 650W 80+ Gold Certified Fully-Modular ATX Power Supply ($83.99 @ SuperBiiz)
Monitor: AOC - AG352UCG 35.0" 3440x1440 100Hz Monitor ($899.99 @ Best Buy)
Total: $2497.58
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-12-07 12:00 EST-0500