for 27" 1440p is a good resolution (and pixels per inch) however you have pro/con of IPS like I said. I want a new monitor, I'd like to get a IPS for better video colour reproduction (I like the colours on the two android IPS phone/tablets I have, they are superior to the TN 24" monitor I have) but worry about IPS glow, poor blacks etc are a major concern.
IPS may have superior colours, but if the black levels are crap imagine playing fear or alien isolation and it's all washed out, with IPS glow meaning corners are very bright...