Which Champion Should I buy?

K i'm level 11 and i recently bought yasuo and i need some good solid champs for draft pick cuz i almost have 16 champs. Now should I get Lee Sin, Darius, Graves, or Syndra? I could go for Zed or Ahri too. Also, does Thresh have a steep learning curve? I know he's hard, but I can always practice. So tell me what you guys think. Thanks
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