Warcraft Pets list the top 20 battle pets, voted by the forum members.
I have 1, 2, 4, 6, 7, 8 , 10, 12, 13, 14, 16, 17, 18, 19.
As I don't do dungeons or raids any more, some are not available to me. I also do not buy from the Blizzard pet store.