Haha, BotD, it's funny that people get so excited when a girl rates another girl in a survey like this. We can appreciate the beauty of other women, and don't have a problem with saying it. 😛 What amuses me is when a guy is like "...eh, he's okay," or agrees with a girl's opinion and then backpedals really fast, like someone's gonna' think he's gay just 'cause he recognized that another guy was attractive. 😛 Anyway...
I'd probably have to say Eliza is the most beautiful of the Buffyverse, just because she's healthy-looking. It got to the point where Sarah looked sick, she was so thin, and Alyson seemed to start losing weight rapidly, too. And that's not attractive in anyone, in my opinion. Plus, Eliza's just got a great personality.