Suggest a new champion for me?

Hey guys it's Strayble here, and as the title suggests, I'm in need of a new champion to play. I plan to buy some IP boosts, so of course I'll be buying runes so don't even tell me to buy runes first.... I will, pinkie promise. Anyway, about the new champion, I'm really enjoying playing assassins at the moment, but right now it IS the tank meta, so I'm torn. I'm thinking about either Kha Zix or Zac. Kha because I think the new cleaver should be good on him, and Zac because he's a tank and because he seems just so.... Fun. Anyway, heres some stuff about me to maybe help you help me decide. Favorite positions: Top and jungle Playstyles:Scale well throughout game, especially late; first blood potential Mains: Rengar, Mundo, Kassadin, Riven, Alistar (kinda) Maybe you can find a pattern I cant? Anyways, thanks guys! Hope to hear any suggestion :)