Consulting Help - Ebay/Amazon Product/Order Management

If you are an Expert Ebay/Amazon product seller or facilitator who is employing one of the many software options out there or have experience with the PROs and CONs of all the softwares out there, I need your help! A link to some of the ones we are considering: [login to view URL] Become a consultant for a day and help us decide which option is best for our client! These are the highlights of the business: -Auto Parts Related -Monthly Sales:$35,000-$40,000, average ticket of $70 -Monthly Number of transactions: 500-600 -About 1500 skus -The business operates out of multiple warehouses, so we need multisite software -Want a fully integrated auction software which will increase automation of listings, packing, shipping, tracking, followups and post-shipment activity like returns and RAs. -Want a scalable solution Client would like a hosted, web-based solution if possible. The client currently sells on eBay, but would like to expand to Amazon, Craigslst and others and wants a CENTRALIZED database for all sites. One touch changes for all listings at once. We have reviewed Solid Commerce, but before committing to this company, we want to know if there are better options. We will be using an excel spreadsheet to upload bulk listings. Tell me why you are the MOST qualified person to help us make this decision. I would like to hire someone who has proven experience in sales, listings and software implementations for online sales through these various sites. Thank you!