This PC build list is for imaginary extravagance rather than practical application.  Building this list in 2018 would cost an insane amount of money.  We can only hope that in 5 years from now, hardware will advance and a build like this would be available to many people.  The below list would the ultimate rig the most intense gaming and creative tasks.

CPU: Ryzen Threadripper 1950x ($800)
Liquid Cooler
: Corsair Hydro H150i ($150)

Motherboard: Asus ROG Crosshair VI Extreme E-ATX ($230)
Case: ThermalTake Tower 900 E-ATX ($180)
RAM: 128 GB, DDR4 3200 MHz ($2000)
Video Card: EVGA GTX 1080 Ti x2 ($2000+)
Solid State Drive: Samsung 960 2TB M.2. PCI-E NVMe x2 ($2400) 
Hard Drive: Seagate 10TB Barracuda 7200RPM x3 ($1050)
Power Supply: Be Quiet BN655 Pro11 1200W ($250)
Wifi Adapter: TP-Link Archer AC19000 PCI Card ($75)
Sound Card: HT Omega Claro Halo PCI Card ($200)
Case Fans: Noctua NF-A14 PWM 140mm x4 ($80)
Fan Controller: NZXT Sentry 3 Touch Screen ($40)
LED Lighting: Corsair Lighting Node Pro ($50)

The total cost of this build list is ~$9600.

Wow.  This build has a CPU with 16 overclocked cores (32 threads), 128 GB of fast RAM, 4 TB of some of the fastest SSD storage available, 30 TB of hard drive storage, quality sound, reliable wifi, premium cooling (which can be controlled with a touch screen for either max performance or total silence).  4K video editing and workstation work would be a breeze.  This build would definitely handle 144 Hz gaming at high resolutions.  Every task between moving/installing files to browsing the web would be handled in a snap.  This build would also be large and generate a lot of heat under loads; Likely, PC’s with specs like this in the future will be more minimalist.