I've enjoyed this LG 43UD79-B 43" 4k monitor, in use for two years now at 3840x2160: <https://www.amazon.com/gp/product/B0711MP768> It has four HDMI inputs, a displayport, and a USB-C and a remote control which is very handy. Been using it with OpenHPSDR and will add the K4 when I get it. 73, Paul N2PK