With the poll updated I still vote to Erina because of the same reasons. Anyone surpassed her yet.
Making a Top 3, I would choose: Erina > Alice > Hayama.

Alice is strong and has many secrets, her way of cook is very uncommon and I think that she will be a great challenge to Yukihira in the future. Hayama is strong as well, and I don't think that he will disappear after the Autumn Election.

For those who voted in the lastest poll, please, vote again.