Corsair themed build. With some ASUS ROG parts, with wi-fi and blue tooth added.
You could go RTX 3080/AMD 6800XT. If they were in stock. However, no up to date graphics cards are in stock. The most frequent cards in stock are RTX 3070 and I thought the Asus is the right theme and well reviewed to match the motherboard.
Case rated highly, good quality PSU, AIO cooling with RGB from Corsair, 32 Gig of RGB 3600 Mhz. Fast storage, you could go Corsair PCIE - 4 with this.
While VA panels have way highest contrast of LCDs making them best choise for darkened/dimly illuminated room, wouldn't recommend them for normal room lightning.
All VAs except couple latest Samsungs have seriously sluggish dark shade transition response times compared to IPS panels.
And this budget could easily get good 27" 2560x1440 IPS.
Prices start from £370 https://www.overclockers.co.uk/benq...-widescreen-led-gaming-monitor-mo-131-bq.html