The raw hardware is one thing. It's objective, X is better than Y. When it comes to monitors, or a chair etc, it depends on the needs of a given user. Not enough info to provide a definitive answer.
On the gaming/editing/streaming front, I'd look to something along these lines:
Mainstream Intel:
PCPartPicker Part List
CPU: Intel - Core i9-9900KF 3.6 GHz 8-Core Processor ($479.99 @ Newegg)
CPU Cooler: EVGA - CLC 280 113.5 CFM Liquid CPU Cooler ($121.02 @ Amazon)
Motherboard: Gigabyte - Z390 AORUS PRO ATX LGA1151 Motherboard ($179.99 @ Amazon)
Memory: G.Skill - Aegis 32 GB (2 x 16 GB) DDR4-3000 Memory ($124.99 @ Newegg)
Storage: Samsung - 970 Evo 1 TB M.2-2280 Solid State Drive ($247.99 @ B&H)
Storage: Intel - 660p Series 2 TB M.2-2280 Solid State Drive ($194.99 @ B&H)
Video Card: EVGA - GeForce RTX 2080 Ti 11 GB XC ULTRA GAMING Video Card ($1099.99 @ Newegg Business)
Case: Fractal Design - Meshify C ATX Mid Tower Case ($88.99 @ SuperBiiz)
Power Supply: SeaSonic - FOCUS Plus Gold 850 W 80+ Gold Certified Fully Modular ATX Power Supply ($119.99 @ Amazon)
Total: $2657.94
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-06-17 13:16 EDT-0400
HEDT Intel:
PCPartPicker Part List
CPU: Intel - Core i9-7940X 3.1 GHz 14-Core Processor ($1290.99 @ SuperBiiz)
CPU Cooler: EVGA - CLC 280 113.5 CFM Liquid CPU Cooler ($121.02 @ Amazon)
Motherboard: ASRock - Fatal1ty X299 Gaming K6 ATX LGA2066 Motherboard ($237.99 @ SuperBiiz)
Memory: G.Skill - Sniper X 32 GB (4 x 8 GB) DDR4-3000 Memory ($139.99 @ Newegg)
Storage: Samsung - 970 Evo 1 TB M.2-2280 Solid State Drive ($247.99 @ B&H)
Storage: Intel - 660p Series 2 TB M.2-2280 Solid State Drive ($194.99 @ B&H)
Video Card: EVGA - GeForce RTX 2080 Ti 11 GB XC ULTRA GAMING Video Card ($1099.99 @ Newegg Business)
Case: Fractal Design - Meshify C ATX Mid Tower Case ($88.99 @ SuperBiiz)
Power Supply: SeaSonic - FOCUS Plus Gold 850 W 80+ Gold Certified Fully Modular ATX Power Supply ($119.99 @ Amazon)
Total: $3541.94
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-06-17 13:17 EDT-0400
Mainstream AMD - although Zen2 (3xxx series) CPUs are right around the corner, as is the X570 chipset.
PCPartPicker Part List
CPU: AMD - Ryzen 7 2700X 3.7 GHz 8-Core Processor ($279.99 @ Amazon)
CPU Cooler: EVGA - CLC 280 113.5 CFM Liquid CPU Cooler ($121.02 @ Amazon)
Motherboard: Asus - Prime X470-Pro ATX AM4 Motherboard ($139.89 @ OutletPC)
Memory: G.Skill - Aegis 32 GB (2 x 16 GB) DDR4-3000 Memory ($124.99 @ Newegg)
Storage: Samsung - 970 Evo 1 TB M.2-2280 Solid State Drive ($247.99 @ B&H)
Storage: Intel - 660p Series 2 TB M.2-2280 Solid State Drive ($194.99 @ B&H)
Video Card: EVGA - GeForce RTX 2080 Ti 11 GB XC ULTRA GAMING Video Card ($1099.99 @ Newegg Business)
Case: Fractal Design - Meshify C ATX Mid Tower Case ($88.99 @ SuperBiiz)
Power Supply: SeaSonic - FOCUS Plus Gold 850 W 80+ Gold Certified Fully Modular ATX Power Supply ($119.99 @ Amazon)
Total: $2417.84
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-06-17 13:17 EDT-0400
HEDT AMD
PCPartPicker Part List
CPU: AMD - Threadripper 2950X 3.5 GHz 16-Core Processor ($799.89 @ OutletPC)
CPU Cooler: Enermax - LIQTECH TR4 II 360 102.17 CFM Liquid CPU Cooler ($139.99 @ Newegg Business)
Motherboard: ASRock - X399 Phantom Gaming 6 ATX TR4 Motherboard ($244.49 @ SuperBiiz)
Memory: G.Skill - Aegis 32 GB (2 x 16 GB) DDR4-3000 Memory ($124.99 @ Newegg)
Storage: Samsung - 970 Evo 1 TB M.2-2280 Solid State Drive ($247.99 @ B&H)
Storage: Intel - 660p Series 2 TB M.2-2280 Solid State Drive ($194.99 @ B&H)
Video Card: EVGA - GeForce RTX 2080 Ti 11 GB XC ULTRA GAMING Video Card ($1099.99 @ Newegg Business)
Case: Fractal Design - Meshify C ATX Mid Tower Case ($88.99 @ SuperBiiz)
Power Supply: SeaSonic - FOCUS Plus Gold 850 W 80+ Gold Certified Fully Modular ATX Power Supply ($119.99 @ Amazon)
Total: $3061.31
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-06-17 13:19 EDT-0400
There are higher core count chips, but the tradeoff in clock speed will hurt your gaming performance.
Monitor, will depend on resolution(s) and preference (gaming, refresh rates vs colour accuracy etc).
Chair, height & weight play a huge factor.
Etc, etc.