Chez Zee is probably a good choice for special events like birthdays or office parties. I've been there a couple of times and the food is definitely of more quality that most other Austin restaurants. But where they really kick it up a notch is on their dessert menu.
They have everything you can think of - from cheesecakes, chocolate cakes, pies, mousse and everything else in between. I've tried several of their desserts and none have disappointed me.
Their menu also has something for everyone. I love their steamed veggies, which are never overcooked and always taste fresh. Their sandwiches are also great.