“And I’ve noticed that you’re a really classy chick.”
Amy thought Jeremy sounded fake, insincere. “Oh, come on,” she thought. “’Classy chick’? Who talks like that?” She thought of Shelley’s friend Brandy, who in her desperate desire to be thought cool called girls chicks, as if that were the term approved by the in crowd. It seemed just as phony in Jeremy’s mouth. What kind of person would think of her as a chick? (
http://www.virtualsalt.com/MDG/mdg9.htm)
"Classy girl" would have a less negative reflection on the speaker, if that's appropriate for the context.