Without a doubt one of these RCA's
I have one that I picked up used for $3 at a thrift shop back in 2002. I estimate that It's ran at least 70,000 hours as a surveillance monitor from 2007 to 2018 till it was having something arcing in the HV when it's cold and first startup in the morning.
It still works and outside of a bit of burn in the picture is still sharp as a tack and the colors are bright and dead on accurate. I've still have to track the arcing down and correct it.