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I’d like to share my experience may be it will be helpful for you too. I use Store Manager for Magento to manage my store. You know, since that time store administration became simple for me. They also have an addon which helps to integrate with eBay… all the information here http://www.mag-manager.com/magento-ebay-integration
If you’re interested in a fully integrated solution that not only integrates Magento and eBay but also your ERP system and can sync with suppliers, feel free to give us a call. Our Magento integration solution is a full multi-channel approach as opposed to just one connector.