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spire2985

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.