database pruning (from web page) and reimport in a Joomla component

We want to prune the database of our trading partner and extract a list of all the cars available for sale on their web site ([login to view URL] or [login to view URL], whatever is the easiest to work with). The list has to be refreshed on a daily basis, pictures have to be captured as well. The cars will then have to be published on our Joomla 1.5 web site ([login to view URL]). The publising on our web site can done using whatever module is available. We already use AdsManager on another web site ([login to view URL],com_mtree/task,viewlink/link_id,1096/Itemid,35/), but you are free to recommend any other similar component if you prefer. The published ads will only be a selection of cars, not the whole list. The selection will be done based on keywords contained in a separate text file (eg. 'Porsche'). The text file will also contain a figure (eg. '125%') that has to be used as a markup for the price of the cars. The ads on the Joomla web site have to expire after 24h so they can be replaced with the next import.