Most monitors now are 16:9, which is the same aspect ratio as a larger flat panel HD television. 16:9 includes 1920x1080, 2560x1440, and 3840x2160 resolutions. IS there a particular resolution you had in mind?
Your graphics card supports G-Sync, which is a variable refresh rate technology and can make flight sims and games smoother. So a higher refresh rate G-Sync or G-Sync compatible monitor is a consideration.
Also, you want to be sure that whatever monitor you are getting has the same connectors as your graphics card. Your signature says Nvidia Titan X, so that shouldn't be an issue since most monitors now have both HDMI connectors and Displayport connectors.