At home on my big computer I have one Dell Ultrasharp 4k display, one QHD (2560x1440), both 32", and one AOC 32" QHD screen. AOC and Asus usually offer very good value for the money, and most of the other monitors around my place are 22" Asus FHD IPS panels. I probably have six or seven of them, and I've gotten those for as little as $120.
I feel like QHD is the best value for the money; you can get a pretty great 32" display for right around $250.
I have an OLED TV. I worry a bit too much about burn in to really consider it for a PC monitor, even if the colors are REALLY impressive.