What Champion is the most suitable

I currently play Nidalee, Akali and pls don't kill me Teemo. I like the mid and top-lane and sometimes support. I now have 3150 ip and don't know what champion to buy next, but i think it should be one of these: -Lux -Le Blanc -Katarina -Karma -Heimerdinger Thanks for your comments. Frightpest
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