For what it's worth, as I am no expert in monitors at all, I just bought this on sale (only £48 over your £500) https://www.overclockers.co.uk/samsung-c27hg70-27-2560x1440-va-freesync-144hz-gaming-quantum-dot-hdr-widescreen-curved-monitor-mo-235-sa.html
Quite frankly i'm blown away by it...