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I got at refurbished Moto G4 for $89usd from Amazon US last autumn. A new one was ~$130 at the time.
The nice thing about Motorola is the lack of bloatwear and that its a well know company, warrantees, etc. So they have always been my default choice.
Other than the camera being OK its handled everything I need. Unless you are a "power user" (cringe) most androids between $150-200 will handle your smartphone needs...and Tbh nothing you've listed requires spending >$150 on a smartphone. The only limitations of cheaper androids IME are the cameras. But a $3-400 android will generally have a good camera, albeit sometimes requiring a bit more consideration than an iPhone - which seem to be able to make even taking a photo in your pocket come out well.
I'd define it as anything under $500 as the alternative would be to have to spend $1000 on the new generation of obvious smartphones are. As long as I've had smartphones I've always owned iPhones (3GS, 4S, 5S).
I have limited knowledge of the other side of the market aside from that the newest OS is Oreo. I basically want something that will last, has decent battery life, can be used well with apps like Instagram and Whatsapp. I still use a mac but I'd like to look at alternatives to try and unhook myself from the Apple teat and the things that have started to piss me off about their products.