I'm much the same. I'm using a 22"1080p 75hz Acer. I would like to upgrade but no bigger than 24" and not sure what to go for.
Asus 280hz 24 inch or the MAG251RX without a doubt. Reccomended the VG259QM in another thread and they seem happy. I used to have a 20inch and its too small 24 inch seems the sweet spot but eventually i will probably move to 27inch 4k but not until it is 4k 240hz.