Advice on Wordpress functionality

Hi, We are building a site in Wordpress and are looking for advice on particular functionality. We want a feature that can sort restaurants in a city guide, like this: [login to view URL] You will see that the site visitor can sort by category of cusine and also by various features, like this: http://www.nycgo.com/index.php/search/1478&1658&1935&1920/?s=1&ctsc=1514. Can you advise us regarding a widget or plug-in (or template) that will do this in Wordpress? Thanks very much!