Comment by bsnnkv
I have the Dell UltraSharp 40 Curved Thunderbolt™ Hub Monitor (U4025QW). It's very expensive, but the 5120x2160 resolution with the 120hz refresh rate is absolutely worth the cost for me over the long run considering how long I spend looking at the screen while coding.
I pair this with my tiling window manager[1] which treats ultrawides as a first class citizen (not all twms do this unfortunately) and I'm very happy with this setup.