I’n that price range : sharp LC-55LBU591U $329 at beat buy is the best good blacks for the money also next would be the Samsung nu7100 $479.99 but I would almost get the sharp Samsung has dropped the ball this year and unless you are stepping up to the 8000 series It’s not worth it.
If you can spend $899 get the lg 9000 backlit you will love it the black almost look like oled and the color is unreal ! Sony 900f is great but it cost more and don’t think your getting anymore out of it good luck