If you're looking to bring your products out to the world at large then Storefront template from Gavick.com would be the ideal choice. StoreFront is the best Virtuemart Joomla template for site owners that value their customer’s time.
Template suitable for: Blog, Business/Professional, eCommerce/Shop
JA Mixmaz is an impressive dark color, responsive premium joomla template designed and developed by Joomlart.com. Template is specifically designed for Ecommerce, however, it can be adapted to other niche as well. It is powered by Joomlart's T3v2 framework and supports K2 and Virtuemart component natively.
Template suitable for: eCommerce/Shop, VirtueMart