Revamping an e-commerce website

I would like to revamp my e-commerce website completely to make it more stunning along with fixing all issues to elevate its online presence. This issues include:
• Professional and attractive design with eye-catching look and feel
• e-Commerce / Shopping Cart Integration for the online purchasing of courses
• Payment gateway integration to accept payment online
• Customer Login / Signup Option Integration
• Completely Bug Free and SEO friendly
• User Friendly
• Based on latest technology
• Back-end facility where one can manage the website one’s without any technical help
We can discuss the price.