Response times are actually very important, I normally look at any panel that is sub 4ms G2G. I'm still happy w/ my Acer XF270hU, has great color reproduction (only 8bit at highest setting but will do 10bit at 120hz), response, and 144hz refresh (IPS). Also resolution depends on the pixel density per panel size, for me 27" is great for 1440p but for 1080 I wont go above 25" due to the pixels not being as dense. If I were to go back to 1080p I would only choose to go IPS based panel or at least a Quantum Dot since I need color accuracy for the panels secondary purpose for image editing (color accuracy is very important for me in that part).