Gaming build for around £1000

Here is what I've got so far. I'm pretty confident I've made some decent choices but I'm a little unsure on the GPU?

https://uk.pcpartpicker.com/list/C4WnKq

New build or upgrade?

• new build
• Existing parts/monitors to reuse? (List with models/links)
  • I have a monitor
• PC purpose? (Gaming, editing, etc. List apps/games)
  • Pure gaming
• Purchase country? Near Micro Center?
  • UK
• Monitors needed? (Number, size, resolution, refresh rate)
  • no
• Budget range? (Include tax considerations)
  • Around £1000-£1200
• WiFi or wired connection?
  • I use wired but it would be nice to have the option of using WiFi
• Size/noise constraints?
  • I would just like a mid tower
• Color/lighting preferences?
• Any other specific needs?