J.D.
If you're looking for a formal choir atmosphere with all the bells and whistles (big holiday productions, bell-ringing troupe, occasional horn accompanyment, three fabulous organs, a full-time staff cantor, etc.), then check out St. Martin's Lutheran Church in downtown Austin, http://saintmartins.org/mus_Choir.html. There's also a smaller ensemble that plays and sings at the weekly contemporary service.