Regarding Dell monitors, i have personally used and seen these 24" models. ST2420L, S2440L & U2412M. Best would be U2412M nicer sharper display & slightly taller than standard 24". Although already died on 4th year. I hate S2440L cause of glossy finish & text is blurry.
The recent Acer models are not bad as well imho.
But tested not on games or video, but graphic editing.

This post has been edited by metaloid: Jul 13 2016, 04:43 PM