You've read the reviews and have formed your own opinions on the devices you've owned and currently own, but with our vast access to devices, the best smartphones feature is meant to highlight the stuff that matters, what we'd buy for ourselves based in a number of factors (particularly price point) and thus make it easier for you to buy the best possible device.
Amazon's Deal of the Day is a certified refurbished Samsung U28E590D 28" 4K monitor. We picked this monitor as a great buy back in 2015 as an affordable 4K option, but $270 is ridiculously low even for a refurbished unit. Of course, you're not getting state-of-the-art specs, but user reviews back it as a solid 4K offering for desktop work (not so much for gaming, in spite of FreeSync support). If you're coming from an old monitor, this will do great as a cheap upgrade, however note this is an affordable model with no height or swivel adjustments.