What should my next 4800/6300 IP champion be?

Hi, I'm a jungle main mostly, although I play support and wouldn't mind playing mid/top once in a while. I have a burning question atm: What is a good 4800/6300 IP champion for me to buy? It doesn't have to jungle or support well. Here is a list of the champions that are 4800/6300 IP that I own: Aurelion Sol, Bard, Braum, Ekko, Jhin, Jinx, Kalista, Kha'zix, Kindred, Lucian, Rek'Sai, Rengar, Tahm Kench, Vi, Thresh, Zed, Ahri, Caitlyn, Darius, Draven, Ezreal, Fizz, Kog'Maw, Renekton, Wukong, and Ziggs. If you have cheaper recommendations that is okay, but they need to be really good to justify my purchase due to the fact that I hate grinding more IP. Here is a list of champions that are 4800/6300 IP that I don't own: Aatrox, Azir, Diana, Elise, Gnar, Illaoi, Jayce, Lissandra, Nami, Quinn, Syndra, Taliyah, Vel'Koz, Yasuo, Zac, Zyra, Brand, Cassiopeia, Fiora, Galio, Graves, Hecarim, Irelia, Jarvan IV, Kennen, Lee Sin, Leona, Lulu, Malhazar, Maokai, Nautilus, Nocturne, Orianna, Riven, Rumble, Sejuani, Skarner, Swain, Talon, Trundle, Varus, Vayne, Viktor, Vladimir, Volibear, Xerath, Yorick.