Basically there all the same, you might get more lumens out the expensive ones, but you'll never be able to tell the difference with a 50"
Whatever you do, don't get rigid, there way over priced and Cree is just as good, I've used apex LEDs before and have had no problem with them, all is included... As far as how much I'd pay, not to sure, never looked in to the curved to know anything about the...