Looking for new champ

I've been stacking up IP for a while and I don't know what to do with it. I love to play Mid, Top and ADC, but I want to work on my top play right now. I typically play Poppy or Gangplank in top lane, (But with Malz's huge buff I might play him top. I love this guy.) I'm looking for a new champ to play top lane, I've been interested in playing Riven , Maokai , Fiora or the like, but I don't want to buy someone without knowing what I'd like. Any suggestions?