Which champion to buy.

So I just got to 6300. I typically play support or jungle because I hate waiting 10+ minutes to go mid and 5+ minutes to go top, and I hate playing ADC. So I just recently got 6300 IP and I'm wondering who to spend it on. I have all champions under 3150 and a handful from the 3150 category, and a few from the 4800s, but I don't think I have any 6300 champion. EDIT: I do have THRESH

So I was thinking I would buy DARIUS, but with how incredibly broken he is right now, I don't want to buy him and then have him get nerfed in a week. I mean I do, but I don't want to waste my IP like that. I was also thinking ZYRA but I just looked up her scalings and her AP ratios are pretty bad, her E cooldown is pretty long for a soft cc. I was also thinking of getting RENGAR but he can't really make use of sated devourer so other junglers will poop on him and he stands no chance in the top lane against those juggernauts. I really don't like BARD, imo he's terrible. I can't deny though that he is incredibly fun to play. As a troll pick he's fun, kinda like Teemo, but as a real pick I don't like him. My last pick would be BRAUM, he's a really good support imo. He lacks a heal but he's got nice peel and good teamfighting.

Any insight would be nice.