Lastly, that Dell example is pointless.
The Asus PA328G or the Samsung U32E850R is far superior for a Gamer. I need essentially what those two offer, in a 40". But I am open to any suggestion that meet my criteria. I just don't have time to listen to all the self-inflicted woes or join/participate in group therapy threads.
For some reason, market for 4K 40" monitors is in some funny state at the moment. Products from big, reputable companies are almost non-existing and essentially your only option are those dodgy Korean units. It does not look like 40" is (yet?) recognized as a 'valid' size for a monitor (some people say 30" is too much already).
What I would REALLY want to see is ~30-40" OLED monitor. LG manufactures 4K OLED TVs and they are absolutely beautiful: ultra wide color gamut, perfect viewing angles, blacks and contrast ratio, instant pixel response time (no ghosting whatsoever), no problem with those crazy backlight artifacts (bleed, glow, halos) - we are talking about 'reference-level' display quality here, that absolutely no LCD panel can come close to. The only problem is they are available in >55" sizes, which is way too big for a monitor.
If they scaled these panels down to 30-40" and equipped them with low input lag / hight refresh rate controller boards, I would pay any (within a reason, of course) money for such product.