27 inch 2560x1440 Monitor

I am looking for a 27 inch 2560x1440 monitor for photo editing and a little gaming. I have been considering the Samsung S27B970d and S27850T(if I can find one), Dell U2711 and the Apple ACD. I would appreciate any thoughts on these monitors. I have read many posts on this forum and others and am still not sure whiche is the best way to go.

Thanks