I'm on 1920x1200 (16:10 FTW). I'd really love to get a newer higher res monitor, with much higher pixel density, but I just can't go to 16:9 as it just looks too wide, and I want more vertical space. If only I could get a 3840x2400 display resolution rather than the regular 4k 3820x2160.
Also, since 3:2 is a bit of a thing with MS, I would go for that as well. I would really go for something like a surface studio if it was a monitor only. I wonder why no one is making something like that.
My problem with resolution is, I don't like odd sizes. Since a lot of content is 1080p, it's better to have some multiple of that rather than weird numbers so that you don't get weird pixel splitting to fill it out. I also don't mind black bars, so getting more vertical space is always a plus.
There's a 30 inch dell monitor I'm looking at on ebay atm, so might go for that to get 2560x1600. Might be a good upgrade, as I'm constantly battling out screen real estate, and haven't got room to go dual monitor, not to mention my current panel is a rather old TFT which doesn't look all that good.