Design / Prototype Web Application

Need assistance in developing Design / Prototype for a new web application.? Estimate the initial project will be 50 - 100 hours of work for the high level design.? The next project would be prototyping.? This will be a consumer oriented site.? Long term objectives will require strong design in order to reduce the complexity of the site.? Flexibility in design to accomodate expansion to other markets. Components will include, user registration, GIS data, APIs to other web sites, volume messging (email, sms, twitter, facebook).