What’s the best phone I can buy for under 800 dollars?
$800 should get you any newest phone from the leading brands at the moment.
HTC, Samsung, Huawei, Oppo, Nokia, Windows, etc come to mind. I personally prefer Samsung the most, but if I had only $200 I’d buy a Huawei.
With $800 I’m sure you can get the literal leading phone at the moment which is either Google Pixel or Samsung Galaxy S8. You can’t go wrong with either of them, especially the Samsung.
P.S nothing wrong with going second hand for a phone. That’s the first place I look.