I do agree on the basic idea of not running two monitors tho. I used to, and I got neck pains eventually.
My current setup is a single 32" curved QHD monitor and I wouldn't change it for the world. It's just the right size so you can see the whole screen at once, yet large enough to run 3 browsers side by side.
Also, I want to suggest people to learn about virtual desktops rather than wasting money on bizarrely huge screens or multi monitor setups.