You cant even get qualified as HDR below 400, and 400 is already ... a bit meaningless. Hollywood and TV authors content for 1000, and theres a mighty disconnect between these first few generations and what the content requires.
To make this worse, my several year old U2414Hs can reach 280 at 100%. Those are inexpensive, standard, 1080p IPS office monitors, that have rather good color consistency for being low $2xx each... and also like 5 years old.