Directory

We are currently developing a content site and would like to offer paid business directory listings.

We will develop the rest of the site, we are only looking for dev of the directory.

Most of you will be familiar with standard php/mysql directory offerings such as esyndicat, phpld etc. We dont need so many features as thoses two apps offer, heres a short list:

Admin can add, edit, delete, expire, promote, demote listings
Promoted (paid for listings) should be able to be served with relevant content in a block in other areas of the site - in articles for example.
Standard directory navigation - a big box of categories, click on one get a subcat etc etc.
Search with filters (a drop menu of geographical regions)
Businesses can upgrade listings, pay by Paypal recurring subscription
Click through stats expoted to CSV, or at least some way of geting stats back to the advertisers
One key feature we would like is members being able to bookmark a listing (to a bookmarks block(?), not their browser:)
Members should also be able to suggest listings.
We dont need comments or ratings etc on listings.

I'm sure with all the contribs here Drupal can do this.

If there is some custom programming required to do this we are willing to contrib it back to Drupal, as I see many many people asking for a Directory.

At this stage we are taking offers of interest. An RFP is available. Some indication of cost would be helpful.