Witcher 2 is almost too much for any system and any GPU, it taxes out even the best of them, arkham origins and fc3are not that bad. I've recently upgraded to a 1440p display as well, the PB278Q to be exact, and have noticed just how much better all my games looked on that display. You can easily find your balance in performance/quality and I'm sure image quality will be better than any of your 1080p. A lot of folks have tried to persuade me to do 120 or 144hz 1080p instead of 1440, but to me the resolution and screen real estate just felt like the better option. If you have a shop near you where you can try out a 1440p display do it, you will never go back to 1080 =)