Here we have Samsung, Philips and ViewSonics, along with a bunch of random cheap AOC's. No complain of product, and not a single dead pixel or any fault whatsoever on ANY of them. The cheap AOC's have even stood up to almost 3 years worth of kids poking their fingers at them, not a problem.
So imo, just pick whatever has the best specs and the aesthetics you prefer for your max budget.
What I would suggest plumping for a 24". There are entry level 24"'s around for under $400, and better ones at just around $500 - $550. I've got a 22" on my work desk, and now that I've picked up a 24" for another purpose, I'm wishing I had gone 24" in the first place, even with identical resolution.