Custom WordPress Theme

We need development of a custom WordPress theme. I have a mockup that I have attached. - We would like a responsive theme - Ok to be a child theme of a free theme, as long as the free theme is recent and not old. - We'd like a widgetized footer - The layout is two columns - needs to support WordPress menus, we will have multi-level and drop downs. Although the site is currently mostly text, we like to have flexibility for the future. support of featured images, support of post / page templates as well as custom post or page sidebars plugins. We will take care of migrating the current content and installing the theme. Please plan to provide the needed files in a zip. We have the ability to "stage" the theme for review.