We are a uprising software company from Inida.
My company website is http://www.krishnatech.com
There are 3 most popular open source e-commerce solutions are out there.
prestashop, oscommerce and Magneto.
On a shared hosting Magneto is slow. The best solution that we have found is Prestashop. If you are interested, we can build the site for you with full customization.
Please visit us at http://www.krishnatech.com.
I am the Project Manager of the company. I will be glad to help you.