Build an E-Commerce Website

We would like to build a new e-commerce website that sells aftermarket computer memory. Similar to [login to view URL] and [login to view URL] We are going to get our database of products from [login to view URL] We need this site to be optimized for SEO, including SEO-optimized url, sitemap, Page Titles, cross-linking, etc. We also want to integrate [login to view URL] as the payment processor. We also need a user friendly and robust admin portal that allows us to add pages, change content (insert new deals of the day banners), add discounts at the mfr, category, and product level, plus email newsletter, and back-end reporting and shipping management system. We will make an immediate payment upon completion and will give an excellent review for a project well done. Either customized site or e-commerce store is fine with us, as long as it provides optimal performance. We are looking to start ASAP.