User blog comment:Lacounty/I need a bigger AD carry (bottom lane) selection./@comment-12314620-20140717220240

If you really want to expand your adc roster I think I could suggest Kogmaw or Twitch. Both scale well, have somewhat flexible buildpaths though require a good positioning.

Instead of expanding your adc roster I would however suggest you to consider on trying to get better on the champions you already play since your roster seems to be quite flexible as it is.

For people suggesting Quinn. I practically mained Quinn early this season, she was great in silver/low gold but when going towards platinum her weaknesses become more and more visible. She relies quite hevily on snowballing and although she isn't that bad in lane her midgame transition is very painful if you are behind. She's also very dependant on her support which in turn can cause very frustrating games...