Website Development - Membership Org

Looking to get current website overhauled. Just not happy with the way it is currently. It needs to be google-friendly; DHTML (I'm told works best but open to suggestion). The purpose of the site is to allow companies to join, set up profiles with photo gallery, blogging ability open to the public, classified ads viewable to the word but only members post. Events calendar that allows sign-ups and comments. Project submissions that go into a database (by chapter, assigned by zip code) and can be assigned by admin of chapter. Take a look at the current site: www.contractingteam.com. We need this to be better.