You can always try to find a good, used Sony. I’ve had excellent luck with all I’ve owned. Also, if a member of Sam’s Club? Try post-Christmas sales. Sure Costco would likewise have bargains.
At least 65”. Google “tv viewing distance chart”.
It’s getting that used ones cost as much as new ones - unless you’re looking for 4k.
I don’t think much of smart tv’s - I have one, and 3 dumb tvs. (2 Visios, 1 Sony, and 1 Samsung) My Samsung is a smart tv, but I ended up sticking a Roku in it.
I’m a cord cutter and get by with OTA and Streaming - oh, and I save money..