Dell Children's is top notch. They are very busy and very wanted.. so if you run late, they re-book you. First hand knowledge on that. But they are highly recommended. Texas Children's in Houston is as well. Both very good practices.
If you come to Austin.. it's only an hour and a half drive as opposed to double that for Houston. (all depending on time of day and traffic).
But if you came to Austin, you could visit me and Meg!

lol