2x of these: Samsung UN40KU6290FXZA You are aiming for something that supports both 4K (3840x2160) [or greater I suppose] and a 60Hz refresh rate in that mode.

2x of these: Samsung UN40KU6290FXZA You are aiming for something that supports both 4K (3840x2160) [or greater I suppose] and a 60Hz refresh rate in that mode. On cheaper models this can be found on a HDMI2.0 input. More expensive ones might have DisplayPort as an option. Shop around during TV season and you can find a quality model for $200/ea.