There are only 3 LCD screen manufacturers so there is little in the technology to choose from tho it's getting better and cheaper as time goes by.
20" screens run 1600x1200 and a very few 19" are native
Look for maybe last years model with a 3 year backlight warranty.
We don't recommend them so we do not have a lot of specifics to give you.
OLED will be a different story but the 20" is only in prototype. Look for a deal is all I can advise.
2x17" might be smarter and cheaper if the form factor allows.
30% more workspace in a pixel count - likely less money.