Need suggestions for new champ to unlock!

Well, I've saved up quite a bit of IP and leveled up the champs I have. I'm in the market for a new one. I'd like something "ADC-ish", something ranged... a solid champ. I don't know much about tiers, and who is used in high level games and that is why I'm posting this. I have Ashe{{champion:22}} , Tristana{{champion:18}} , and Annie{{champion:1}} already. Was looking at Caitlyn{{champion:51}} , Katarina{{champion:55}} , maybe Twitch{{champion:29}} , and I guess maybe Teemo{{champion:17}} ... even though he seems pretty cheese (although I could be totally wrong.) I played LoL when it released and then quit for a number of years, so I'm shaking the rust off but having fun doing it. I'm also finally starting to do pretty well overall. Damage dealing melee characters like a Fiora{{champion:114}} I would also consider, IF you guys helping me think that would be a good move. I would appreciate all the help I can get. Thanks for taking the time to give your 2 cents to a stranger. <3
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