Best Approach for WordPress site with Multi-Vendor E-Commerce

I have a WordPress site to which I want to add a storefront. The primary requirement of the store is for multiple vendors to be able to add/update/etc. their products w/o my (admin) intervention.

I’ve tested the WP e-commerce plug-in but it doesn’t appear to meet my multi-vendor requirement. I’ve also looked into OSCommerce and Zen-Cart and this is when I started to get confused. It seems that these are good e-commerce platforms, but I’m unclear on how they are when integrated with WordPress. Also, is it best to have a standalong WP install that is intergrated with a standalone ZenCart (or OSCommerce) install or is it better to use a WP plug-in?

I read about a ZenCart plug-in called “WOZ”, but I can’t seem to find it. The only ZenCart plug-in I find through the WP plug-in search is a plug-in that requires “WOZ” to be installed first.

Am I getting close? Many thanks for any help you can offer.