Hey there. Man there is a huge market for gaming monitors.
It's honestly going to come down to a few things. Are you looking for gaming on a big display or a 24 inch? What HZ are you looking to game on? A lot of people who play counter-strike global offensive and overwatch prefer 120 or 144hz monitors.
http://www.newegg.com/Product/Product.aspx?Item=N82E16824160226
The one above is a GSync 144 hz monitor great display. It is on the smaller side though, but is good for FPS games. $349 guess it's on sale. I have this one the other recommendation I have is anything BenQ.
Edit: Should probably add your specs as ShadowTechXTS mentioned plus what you intend to use it for. Display size is probably what's important.