I love Audra McDonald's voice because it's very dramatic and strong. I adore Kristin Chenoweth's legit soprano, I think she has great technique and I have about the same range as her. The only time I've heard Kelli O'Hara was on the Tony's and I was smitten, she has a very beautiful voice. I also love Laura Benanti's voice...her rendition of "Initials" on the Hair Benefit CD makes me laugh so hard. I think Jennifer Laura Thompson has a very unique voice, the first time I heard "Follow Your Heart" from Urinetown I died her voice is so weird, but I love it. She was the first Glinda I saw and she had a cold, lol, so her voice wasn't very strong but her acting definitely made up for it.
And of course, Julie Andrews.
--Like an odd exotic creature on display inside a zoo, hearing children asking questions makes me ask some questions too...--