$3000 is a lot. You can get something quite good like the build above.
Here are two other options:
Ryzen with Liquid Cooler-
PCPartPicker part list:
https://pcpartpicker.com/list/YLXTnH
Price breakdown by merchant: https://pcpartpicker.com/list/YLXTnH/by_merchant/
CPU: AMD - Ryzen 7 2700X 3.7GHz 8-Core Processor ($319.99 @ Amazon)
CPU Cooler: Corsair - H100i v2 70.7 CFM Liquid CPU Cooler ($101.03 @ Amazon)
Motherboard: Asus - Prime X470-Pro ATX AM4 Motherboard ($177.39 @ Amazon)
Memory: G.Skill - Ripjaws V Series 32GB (2 x 16GB) DDR4-3200 Memory ($329.99 @ Newegg)
Storage: Western Digital - Blue 500GB M.2-2280 Solid State Drive ($109.99 @ Amazon)
Storage: Seagate - Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($59.79 @ OutletPC)
Video Card: EVGA - GeForce GTX 1080 Ti 11GB SC2 Video Card ($749.99 @ B&H)
Case: Phanteks - ECLIPSE P400S TEMPERED GLASS ATX Mid Tower Case ($59.99 @ Newegg)
Power Supply: EVGA - SuperNOVA G3 750W 80+ Gold Certified Fully-Modular ATX Power Supply ($99.89 @ OutletPC)
Operating System: Microsoft - Windows 10 Home OEM 64-bit ($95.89 @ OutletPC)
Monitor: Dell - S2716DG 27.0" 2560x1440 144Hz Monitor ($434.98 @ Amazon)
Total: $2538.92
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-05-19 23:53 EDT-0400
32 gigs of RAM. 144Hz 1 ms 1440p monitor. Ryzen 2700x and a 1080Ti.
Ryzen without liquid cooler:
PCPartPicker part list:
https://pcpartpicker.com/list/f2MBjy
Price breakdown by merchant: https://pcpartpicker.com/list/f2MBjy/by_merchant/
CPU: AMD - Ryzen 7 2700X 3.7GHz 8-Core Processor ($319.99 @ Amazon)
CPU Cooler: Noctua - NH-D15S 82.5 CFM CPU Cooler ($79.89 @ Newegg)
Motherboard: Asus - Prime X470-Pro ATX AM4 Motherboard ($177.39 @ Amazon)
Memory: G.Skill - Ripjaws V Series 32GB (2 x 16GB) DDR4-3200 Memory ($329.99 @ Newegg)
Storage: Western Digital - Blue 500GB M.2-2280 Solid State Drive ($109.99 @ Amazon)
Storage: Seagate - Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($59.79 @ OutletPC)
Video Card: EVGA - GeForce GTX 1080 Ti 11GB SC2 Video Card ($749.99 @ B&H)
Case: Phanteks - ECLIPSE P400S TEMPERED GLASS ATX Mid Tower Case ($59.99 @ Newegg)
Power Supply: EVGA - SuperNOVA G3 750W 80+ Gold Certified Fully-Modular ATX Power Supply ($99.89 @ OutletPC)
Operating System: Microsoft - Windows 10 Home OEM 64-bit ($95.89 @ OutletPC)
Monitor: Dell - S2716DG 27.0" 2560x1440 144Hz Monitor ($434.98 @ Amazon)
Total: $2517.78
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-05-19 23:53 EDT-0400
Intel with liquid cooler:
PCPartPicker part list:
https://pcpartpicker.com/list/7dTsLJ
Price breakdown by merchant: https://pcpartpicker.com/list/7dTsLJ/by_merchant/
CPU: Intel - Core i7-8700K 3.7GHz 6-Core Processor ($328.00 @ Amazon)
CPU Cooler: Corsair - H100i v2 70.7 CFM Liquid CPU Cooler ($101.03 @ Amazon)
Motherboard: Asus - ROG MAXIMUS X HERO (WI-FI AC) ATX LGA1151 Motherboard ($248.89 @ SuperBiiz)
Memory: G.Skill - Ripjaws V Series 32GB (2 x 16GB) DDR4-3200 Memory ($329.99 @ Newegg)
Storage: Western Digital - Blue 500GB M.2-2280 Solid State Drive ($109.99 @ Amazon)
Storage: Seagate - Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($59.79 @ OutletPC)
Video Card: EVGA - GeForce GTX 1080 Ti 11GB SC2 Video Card ($749.99 @ B&H)
Case: Phanteks - ECLIPSE P400S TEMPERED GLASS ATX Mid Tower Case ($59.99 @ Newegg)
Power Supply: EVGA - SuperNOVA G3 750W 80+ Gold Certified Fully-Modular ATX Power Supply ($99.89 @ OutletPC)
Operating System: Microsoft - Windows 10 Home OEM 64-bit ($95.89 @ OutletPC)
Monitor: Dell - S2716DG 27.0" 2560x1440 144Hz Monitor ($434.98 @ Amazon)
Total: $2618.43
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-05-19 23:54 EDT-0400
Intel Without Liquid Cooler:
PCPartPicker part list:
https://pcpartpicker.com/list/b6ZsLJ
Price breakdown by merchant: https://pcpartpicker.com/list/b6ZsLJ/by_merchant/
CPU: Intel - Core i7-8700K 3.7GHz 6-Core Processor ($328.00 @ Amazon)
CPU Cooler: Noctua - NH-D15S 82.5 CFM CPU Cooler ($79.89 @ Newegg)
Motherboard: Asus - ROG MAXIMUS X HERO (WI-FI AC) ATX LGA1151 Motherboard ($248.89 @ SuperBiiz)
Memory: G.Skill - Ripjaws V Series 32GB (2 x 16GB) DDR4-3200 Memory ($329.99 @ Newegg)
Storage: Western Digital - Blue 500GB M.2-2280 Solid State Drive ($109.99 @ Amazon)
Storage: Seagate - Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($59.79 @ OutletPC)
Video Card: EVGA - GeForce GTX 1080 Ti 11GB SC2 Video Card ($749.99 @ B&H)
Case: Phanteks - ECLIPSE P400S TEMPERED GLASS ATX Mid Tower Case ($59.99 @ Newegg)
Power Supply: EVGA - SuperNOVA G3 750W 80+ Gold Certified Fully-Modular ATX Power Supply ($99.89 @ OutletPC)
Operating System: Microsoft - Windows 10 Home OEM 64-bit ($95.89 @ OutletPC)
Monitor: Dell - S2716DG 27.0" 2560x1440 144Hz Monitor ($434.98 @ Amazon)
Total: $2597.29
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-05-19 23:55 EDT-0400
$3000 is way more than enough for a good PC. If you want, and do not mind the loss of Gsync, you can swap out the monitor in this build with these:
1.
https://pcpartpicker.com/product/yRdFf7/samsung-lc32hg70qqnxza-490-3840x1080-144hz-monitor-lc32hg70qqnxza - 31.5" 1440p monitor with 1 ms and 144 Hz
2.
https://pcpartpicker.com/product/hLYWGX/samsung-c34f791-340-3440x1440-100hz-monitor-lc34f791wqnxza - Ultrawide 3440 x 1440p monitor with 100 Hz.