right around QHD is the sweet spot imo. I use 3 30" Apple Cinema HD Displays @ 2560x1600 (my school was throwing them out), and theyre perfect for everything. games, code, movies, whatever. Needs dual link dvi though, so old gpus only.
I was so sad when my old super-IPS korean yamaguzi died. 2560x1600 30" but incredible clarity, modern monitors with higher PPI look so bad and fuzzy compared to it. Dual link dvi for the win!