Implement a design and concept for a next-generation web application

We have an application with a client-side based on Yii framework, related to the automotive industry and aimed at both the private and the commercial sectors. The system itself is offered to users with different levels of sophistication in computer operation and we aim at making it as simple and as intuitive as can be for all of our users. We need a graphics designer/artist with a good understanding of web applications and complex data scenarios, that will be able to carry out an upgrade, or a face-lift, to our the visual design, while taking into account our guidelines and and the quality of user-experience. Our current user-experience and graphics guidelines for this project are : 1. All of the operations in the system have been segmented into smaller views or action units, this allows for each view to be clear and concise about it purpose and usage towards the user, we want the design to support that philosophy. 2. Keep each view in the system as light-weight as possible in terms of data-density and controls layout. Not as a minimalist approach but as a behavioral simplification approach. 3. We aim for the most compact and human-readable layout of information and actionable items in every view. 4. Please consider that the system provides font-scaling, color-palette-based theme-changing and bi-directional multi-language support. 5. We provide stream-lined validation for data entry in order to optimize the flow of various UI processes using real-time UI-responsive updates to guide the user. You will have some advantage if you can show some related work in this field. 6. We use many dashboards, you should be well seasoned with charts, graphs, gauges and related concepts and also suggest it yourself where necessary. We look for the design concepts like those found in Twitter, Google Webmaster, Google Analytics and Fleetio to name a few. If you have the skills we would like to see some further (possibly related) work from you. We also want to get offers or at least the possibility for fixed prices, work-unit based pricing or hourly price. For fixed price or work-unit offers we ask that the offer will refer to one screen with the complexity demonstrated in the attached wireframe sample.