Tools/Components for building a Survey Application

We are designing a survey application with the following features

1. The users will be able to select questions from a set of predefined questions.
2. Each question has a question type defined which dictates the type of answer (multiple choice, DB look up, free text etc)
3. The user can create a hierarchy of sections with multiple questions with in each section.
4. The responses of the survey will be stored to an SQL server database.

There is also a requirement to generate an output document from each survey response.

We are planning to implement this application using ASP.net.

I am looking for suggestions which will help us reduce the development effort. Is there any commercial/open source application which we can customize for our needs? is there any ready-made components which helps creation of dynamic ASP.net pages? I am only interested in application which i can host locally, as this has to be integrated to an existing application.

This may not be an exact fit, but worth looking at: Surveymonkey.