Taxonomy, subsites and workflow - advice needed for int'l org

I work for a large international non-profit organization and seek to integrate our existing mess of 40+ websites in one CMS. I can tell you this is going to be an interesting undertaking :)

Based on a test installation and review of documentation, Drupal seems to offer all we want a CMS to do (and more..): subsites based on specific keywords (taxonomy), rights management and workflow for submission, editing and approval of content (workflow), and - in the end - creating subcommunities and the integration with contact management (CiviCRM).

I am looking for an experienced Drupal developer to provide advice on the suitability of Drupal for our website. It would entail (1) a quick review of our plans, (2) your judgement whether or not Drupal is a suitable system for us, and (3) an estimate of the time and money involved in customisation to meet our needs.

I don't think it will take a lot of time, maybe a quick phonecall would do the trick - in any case, I am willing to pay for your time.
Let me know if you think you can help us.

Thanks,
E