This is the best 4K TV I could find to use as a computer monitor. And to my surprise it works really well, especially for productivity.
Sony KD43X720E 43" 4K TV
https://amzn.to/2I3BIB0 (US)
https://amzn.to/2r2r0Cw (CA)
https://amzn.to/2FkHdIr (UK)
Alternatively you could just get the LG or Dell 43" Monitor instead of a TV if you want DisplayPort connectivity, proper standby power and stand. But I found the Sony TV route a little cheaper and it's also flicker free, whereas the LG/Dell aren't.
LG 43UD79-B 43" 4K PC Monitor
https://amzn.to/2FkDpaa (US)
https://amzn.to/2vPHWBZ (CA)
https://amzn.to/2r2QReB (UK)
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