It really depends on your needs. If you have the 970 you should try looking towards Gsync monitors as it is a great technology(though a bit on the pricey side). With such a new card I would also get over 1080p and move on to 1440p, I did that just a few months ago and it's gorgeous, I found that the resolution of 1080p above 24" monitors can be a bit low, seeing as I sit close to my montor while gaming and can see the dots(like the image has a texture to it) in certain color combinations.
It also depends wether u need/want 60Hz+ monitors. I am using an AOC q2770pqu and I can't be any happier with it. I wanted to buy the RoG Swift but it cost twice as much and I am also using AMD
If you want higher refresh rate monitors I heard good things about asus vx series.