Sorry to hear about your F8K
I have no idea how they can come up with a satisfactory replacement , because they just don`t make a tv like the F8K.
It quite literally is a dying breed.
Just think about it , at the very least . the "F" was the last to have an animated menu system.
It was the last to include 4 glasses and 2 remotes.
Mine is on it`s way out , no tv will last forever , there is a place next town over where I live , they are supposed to be Samsung Certified , that`s great , but what if you can`t get the part.
I more worried about having to shop for a new tv than I am my F8K failing , but of course it must at some point.
I have pondered over different brands , but there is nothing everyone is making junk.
If you do as much research as I have it will scare the hell out of you to find out your best choice might be Vizio
But all you have to do is put the pieces together , it`s an ugly fit to be sure , but the only fit.
So sad (:::::::::::::::