Cutting engine Hotel Booking engine - Spec it out for us

We are doing research on what would constitute an ideal and most cutting edge booking engine. We are looking for detailed specs that would be required to build the best in breed and want to assimilate all the specs in a document. The next step would be to purchase the closest match and then customize it. We are looking for an advanced programmer with focused experience in building hotel booking engines such as [login to view URL] [login to view URL] [login to view URL] GUI and front end functionality, AJAX filters, fast loading prop lists, optimized data structures are only part of the magic. The trick is in the admin panel. And not to mention connectivity - XML into hotel partners. Did I mention GDS connectivity? Advanced SEO planning? Affiliate marketing? So this is a pretty big project and at this point we are simply looking for a solid professional to give us insight into the best run portals and what it takes in the form of detailed specs, architecture. You must have built these on your own or lead a team to have done this previously and also know of this niche market inside out - you will be quizzed GDS, freesale functionalities, database design. So place your bids, this could land you a much bigger project as well!