Well taking a purely random pick of used LCDs the 4:3 and 5:4 shaped ones were more likely to be optimised for office apps only, and have motion blur when used for video or gaming. So you want to be hunting out the better half of the last half of production for the faster ones. Then also there gets to be high proportion of backlight failures, some badcap period issues (Though anything 10+ years old could have exceeded the design life of good caps anyway) and some lead free solder switchover period issues (Earlier widescreens fall in there too). What I say though is that specs and reviews tell you nothing. Even retro enthusiast recommendations are a bit of a minefield, use them with a different video card and the way it handles the DDC or goes a few khz one way or the other on various screen modes (Which a CRT would have handled fine), even different refresh rates for resolutions, could mean that what works great for them, won't work for you.
In general, I would recommend just grabbing whatever you can pick up for a few bucks locally and trying them, thrift/charity shops, local classifieds, anywhere where you see them going for cheap.
Unicorn herding operations are proceeding, but all the totes of hens teeth and barrels of rocking horse poop give them plenty of hiding spots.
