Let's just pretend a couple of these champs AREN'T stupidly cheap (One even being free) and I should already have them. Just from a gameplay/character standpoint.
I know Quinn's pretty strong this patch, but she's supposed to be getting nerfs, and I'm moreso looking at how fun/unique their kit is, regardless of strength.
Never pick a champion based on how OP they are said to be: play champions that you enjoy playing.
Alistar you can get for free, so you can just pick him up Amumu: if you need a good tank jungler (he's also cheep so if you have the IP, then you go ahead and pick him up) Anivia: if you're good at playing safe. She is very slow with no mobility Ashe is in a bit of a weak spot, but can still work with the right comp (also cheep, see Amumu's point) Karma....I really have nothing on that one Quinn: Quinn is quite a difficult champion to master. Depending on the role you pick for her, it will be awhile before you master every part of her kit Rammus: if you need a good ganking jungler and hate ADCs Thresh: if you need a good support Zac: again, nothing really on this guy
No 
, now im sad. 
Bard :^)
