Website Beta/ Security Testing

Hi, We are inviting offers from reputed and proven beta/security testers to provide the following testing services for a medium-scale online car sales webiste. Site technology used is PHP/MySQL hosted on a public linux server. Interested service providers are required to utilize comprehensive test cases and deliverbles include detailed reports, test cases and recommendations on fixing identified shortfalls. -- HTML, CSS validation and image, link consistency testing -- Functionality and Usability testing.(Require detailed reports and test cases) -- Stress, Regression and volume testing. (Require volumetrics) -- Cross-browser, resolution and download speed testing. (detailed reports) -- Security: Code validation, penetration and vulnerability testing (both front end and database) (Require mitigation methods on identified risks) I would ideally like to see this completed within 7-10 days with a budget range no more than $300. Thanks and please don't hesitate to pm me for any queries.