Depends what you want to do on your 2nd monitor. I have a LG32gk650f now and comparatively this sets the bar high for a great entry level 1440p 144hz monitor for gaming. But I would worry about 250nits and not delivering good color depth especially with darker scenes. On a different note, personally I didn't enjoy a samsung monitor i tried with a 1800R curve unless I was dead center in front of it so I went back to two flat screens.
I have a IPS with 350nits as a 2nd monitor and the picture is a little more pleasing to watch movies on.