I would really only suggest 1080p for 24" or less for gaming, you can notice the difference 27" is pushing it. 1440p is not overrated it is a clear noticeable difference, once you go 1440p you'll never go back. Also in my opinion 1440p @ 60fps > 1080p @ 144fps. I have a acer xb270hu which has 1440p, 144hz, and gsync so i have the best of both worlds but I would definitely say 1440p is more noticeable.