We are looking to upgrade our existing 15years old eCommerce website.
At Present we using CreLoaded paid flavor of osCommerce .
Drupal for blogs.

Looking for the best , Paid , Seo Friendly , safe, eCommerce software

Good to have: Wholesale and retail store front. Max integration's to Payment gateways. Max no of integration to marketplaces like amazon , ebay etc
Max no of integration to Social Media sites like facebook , twitter etc
module for Google sitemap and shopping feeds
Customer portal and support.

Your professional input is very much appreciated.

Thanks for your time.