Create NEW website for new company - repost

Want a new site built for our new business. Not sure if wordpress would be good or HTML/PHP is better. I want it to be easy to manage. It needs to be clean, professional, and unique. Key Features of site: (1) Login Feature for clients to see where they are in timeline of their specific project (2) Login Feature for my staff (back-office) to update timelines as they are met. (3) Want client to be notified via email when timelines are met (checked off by staff) (4) Want strong SEO backlinks already built (5) Want email addresses set up through Google Mail (6) much more... Please send a minimum of 3 sites you have developed that have somewhat similar features to what we are buidling. Please send timeline for you to complete project. I will not pay the initial amount until I see an active demo of the back office/client side/and website. We will produce all files needed in timely manner...look forward to finding a long term client to partner with!