@LizzyBee That one would definitely work. I was set to link you the Newegg listing for the same monitor, as it was $30 cheaper than on Amazon, but it looks like Amazon found out and dropped its price.
You're probably aware, but just in case, the 21.5" measurement is the diagonal, not the width. As an example, the Asus monitor's dimensions are 19.60" x 14.96". The 23.8" version is 21.28" x 15.89" (or 12.79" without the stand).
https://www.newegg.com/asus-va24ehe-23-8-full-hd/p/1FR-000R-00024?Item=1FR-000R-00024
As far as resolution goes, there are hardly any 21-22" monitors with a higher res than 1920x1080 (FHD). It's when you get to the larger sizes, usually 27" and up, that FHD can start to look grainy, and a higher res monitor would be better. But if you're not looking for that size, FHD would be fine.
