Best ecommerce script for importing a big CSV file?

[Duffman]

Hello, I've got a big CSV file with products (category, name, price, desc, image link....) and I am looking for an Easy and Accurate Ecommerce script that will export the CSV data into the ecommerce script.

I am trying out "The Jewelry Shop" template for WP, but seems do damn damn hard to use, and the tools to import the CSV does not work or are too simple

Thank in advance!!