Which name do you in find most appealing?

I am currently writing a short story for a local contest. So far, the manuscript has been a hit with my peers, but there is one problem: the first name of the main female character, Kathleen. It apparently doesn’t fit her personality to well. So, I have come up with two alternatives: Auria and Dianna.

Out of Kathleen, Auria and Dianna, which do you think sounds the best, or is most appealing? Why?

(The character in question’s last name is Smist).