advanced survey module for drupal

Hi,

I need an advanced kind of survey module for Drupal with the following possibilities:

- build questionnaires with dropdown, radio button, ...
- make groups of members with hierarchical structure
- send questionnaires to groups of members on more or less a monthly basis
- possibility to change the header/footer per questionnaire
- display the average result to each participant
- collect the results of each group/subgroup/subsubgroup...
- have to possibility to view per user what questionnaires he/she participated in and what he/she filled in and have these results stored, ready to perform advanced statistics calculations
- export the results in comma separated file
- sort and search within the survey results

I have checked other open source survey systems like phpesp and phpsurveyor, but they lack for me a good structure of user groups and possibilities to interpret the results. I am hoping to be able to use certain aspects of structuring which are present in the taxonomy system of Drupal.

I don't have the time to completely develop it myself, but have a customer which is really willing to invest in a stable well structured survey system. I think such a professional survey system could be very important for Drupal itself also as there is a lot of interest from the market in those kind of systems.

So I am seaching for a developer that could develop this, and also give a start to a new open source advanced survey module as a part of Drupal. Please contact me with quotes or proposals for this project. Any other investors which would like to help financing this project are of course also welcome.