Travel price comparison

I need a travel price comparison search engine. Initial contract will be for comparing holidays products like Kelkoo with specific criteria : - destinations - departure date - return date or vacation length - flexibility period - prices The site will be capable of parsing xml files of travel agencies and crawling another travel websites when they don't have xml files. The descriptions will be parsed into a database each day. At the beginning, I require a site for comparing two english travel agencies. Each time someone requests a price comparison, the visitor will be capable to sort the results list with pricing, pictures and logos merchants, and go to each travel website to find the complete page. No web design, just php script & MySQL database with php files. If you need any other info, please don't hesitate to contact me.