Magento Etilize Integration

We are migrating our ecommerce website from Volusion. We intend to contract with Etilize Spex service for our content. We need the following: 1. An interface to allow import of product information from Etililze database. Feed will include product number, attributes, description, etc. The interface should allow us to selectively choose which items to upload or update and also include do not overwrite capability for certain items. 2. Ability to automatically import attributes data from Etilize to Magento site. 3. Ability to import & manage product feeds from Ingram, DBL, D&H;, Tech Data and other suppliers. 4. Ability to set pricing based upon feeds - lowest cost & inventory availability. 5. Ability to update pricing/inventory status nightly or automatically via appropriate api’s to wholesaler. 6. Ability to integrate image file transfer from Etilize to Magento site. 7. Ability to create pricing formulas to determine selling price. The interface could be based upon Magmi open source or a custom application. Ease of use is paramount.