Which new champ should I get?

So I have been playing as sivir for a while and I really love her, but I'm getting bored of constantly using her. Im still a newbie so I dont really have much experience in champs but I already know that I dont like mages or support that much. I have enjoyed playing Cho'Hath. I usually play with my friend who uses kindred or miss fortune if that matters. I like long ranged champs but Im willing to try someone else, thanks!