Which champion to buy?

For some reason I can't login on my main acct to post this so I remembered that I had this acct so I'm going to post it here. Which champions should I purchase? Right now I am going to purchase {{champion:412}} when he goes on sale, But I really can't decide who else to buy. I main jungle/support, But I can't really much decide whetever to buy {{champion:154}}/{{champion:121}} or {{champion:266}} ?
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