Magento 1.7 and Drupal 7 integration - URGENT

We have Magento 1.7 and Drupal 7. We wish common login system. I mean that the user registrations will only stay in Drupal tables. Magento will simply authenticate the user by querying Drupal's user database or via Drupal's API. Similarly, the registrations from magento or Drupal will have the data stored only in Drupal's user DB. Maybe we disable registrations from Magento and have only in Drupal and use API of drupal to authenticate a user in Magento. I am throwing ideas. You know what we want. Common login between Magento and Drupal. You need to install a Magento 1.7 and Drupal 7 on a development server and play with the options and make it work. Let me know your thoughts of how you will proceed. Once I confirm your plan, lets proceed. Work is urgent and needs a near to accurate timeline. Then once done, you need to apply this to our actual magento and Drupal setup. I am not sure of the budget, so feel free to bid your price. WE WANT TO START THIS IMMEDIATELY WITH ACCURATE TIMELINE. Thanks. ONLY BID IF YOU KNOW WHAT YOU ARE DOING :) Love, Angel