Improvements to existing site

We are looking for an experienced programmer that can help us finish a ready-built website. The nuts and bolts are there but we want some assistance in final design, building the user interface and other coding needs. Someone good should be able to do this in a few days, perhaps a week. We need someone very proficient at 1. Interface design – css layout, presentation of search results. Your portfolio needs to include top quality, very efficient and robust sites. There is one main page to work on and about 10 supporting pages (like registration, about us, registration confirmation etc) that need to be created/improved 2. AJAX and ASP.NET to build an easy to use site 3. Writing SQL queries and stored procedures, especially regarding building results for search results. Using efficient query and table structure and good database design. 4. Making sure the site is efficient for SEO purposes. Say if you have questions or need more details. We have put this project in the $100-$300 range, but if you are uncomfortable with that, bid what you think.