Space was an issue for me, so I ran a single 31.5inch monitor (above) + laptop (below). As a work monitor, I valued real estate and color reproduction more, so I was looking for anything that was IPS and 1440p with a decent refresh rate.
This worked well for me for the past 1+ year. No clue why the retail price is so high though, I picked it up for maybe $200-250.
If I could do it all over again, I'd probably try to find a 4:3 instead of using a widescreen. It's just better use of space. Distance between the user and the monitor as well as desk space is important too. Looking back, a smaller 28-30 inch monitor would've served me better. Having a giant light panel in front for numerous hours likely affected my vision in the past year. So in my case, bigger is not always better.
Going to also hijack this post a little. If anyone has recommendations for a good computer desk, please drop a link. I'm moving into a larger space soon, so I'm hoping to find something with a little more depth.