lol! I'm a huge Ayu fan, but I have to say I've really liked listening to Otsuka Ai recently! I prefer her crazy pop songs over a lot of Ayu's super pop songs. -cough- But I'm still an Ayu fan!
I'm only really a Hikaru Utada hater (and that's not even the right word... I just don't like her music that much). But yah, I voted Otsuka Ai.