Hello, I am Siva from India. I can upgrade your website from version 1.5 to 1.9. I know, it is not that easy. I have 6 year experience in PHP, Magento, MySQL, RoR, CodeIgniter, HTML5, CSS3, Java and Javascript. No need to pay, if you are 100% satisfied. Contact me.
My Queries:
1. Have you done the code audit for your Magento website?
2. Do you have a paypal integration and product/service search?
3. Have you done the previous attempts on a test server?