I need a TV lesson

[Speedy]

Go where you can compare. I think Best Buy still has a lot of TVs on their showroom floor and then you can always buy elsewhere. 1080 is the minimum but if you expect to use them for a long enough time, go 4k, at least for the biggest one. LCDs have different real refresh rates. Try to get a refresh rate of 240 but watch out for claims or names that make it seem the TV has a 240 refresh rate when it is actually something else like 120.

I love my plasma Vizio.