>Seems that most monitors nowadays are focusing on high framerates for gaming and colorspace support for visual creatives. The latter are usually very expensive.

Disregarding the high framerates, I often wondered if someone ever wrote a display application that achieves higher dynamic range by alternating pixel values over frames, sure it would need to be calibrated, say by a photodiode stuck against the screen, lowpass filtering the signal...

It seems like one might "try out HDR" on conventional monitors, to find out if they are worth it... \ which also raises the question if these HDR monitors are not simply storing the last frame(s) to deduce what the appropriate 24bpp (8b per channel) intensities should be such that for static images & static gaze the illusion of HDR is recreated... perhaps this exact trick is what caused ghosting in the first generations of LCD monitors?

I don't know if $700 qualifies as cheap, but the iiyama ProLite XB2779QQS-S1 (5K) seems to fit your description. I am quite happy with mine.