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Speaking from around 1500 elo, I'd pick janna. I loved sona, but she since that last nerf she is just too squishy. If you play here you need a 21 def mastery tree and some runes. Taric, leona, blitz or any cc support with a graves, corki, twitch, vayne (more burst than say ashe/kog) can just instakill her.