I can heartily recommend Dell monitors, generally-speaking. Get an IPS 24" (consider 1920x1200 instead of 1920x1080 if screen real-estate is a factor).
If, like me, you hate reflections, get a matte finish and ignore the claims that the colors aren't vibrant or the image isn't sharp. I have a 43" Philips Momentum 4k glossy flanked by two 24" FullHD matte Dell monitors in portrait orientation. I can best describe the difference between the images thus: With the glossy monitor, I'm looking at imagery enclosed in a reflective screen. With the matte monitors, it's more like I'm looking at imagery that is directly exposed to the air, with nothing in-between.