I vote for OpenCart. Fast, simple and easy to setup and use.
Another consideration is Magento. It's nice, but very feature-packed...most people might not need all the features, so it might be too overwhelming.
Both scripts are open source scripts.
█ John Lee
█ Vodien Internet Solutions Pte Ltd -------------- Latest Intel Servers Now Available!
█ Singapore Datacentre ★★ Native English staff ★★ Singapore Web Hosting
█ http://www.vodien.com ★★ 24/7 Super Support ★★ Call +6562886264
I agree that this type of store is perfect for the Miva Merchant interface. Look into Miva Skins and Modules too for store customization ... very easy to use and excellent support, especially if using one of their premier partner hosts.