E-Commerce Order Management Solution

I have tried numerous order management solutions and I am not happy with any of them that are out there. Below is an outline of what I need this software to do and this will probably be an ongoing project so we would need to work out a retainer agreement for future service to the software. Order Management Solution – 4 Modules (Order management, Inventory Management, Listing Management, Re-pricing Management) General Functions needed 1. Web-based probably on Amazon server farm (PHP most likely) 2. Multi-channel – Amazon, eBay, Paypal, [login to view URL], Newegg, [login to view URL], Magento plus any other channel that we want to add 3. Shipping partners – USPS, UPS, FedEx Order Management Module 1. Shipping Labels – Invoice with embedded shipping label, ability to bulk print 2000+ labels at a time – need to be able to edit (add/remove items) 2. Be able to map shipping service purchased to correct shipping service – only applies to our own website orders 3. Pick List – needs to be dynamic (changeable) – picture, sku, name, quantity, location 4. Keep records of past orders 5. One page order list – I have a software I have used that I can refer you to so you can see what I want 6. Manage RMA’s – not necessary function right now – need to do more research to see if I want this feature 7. Setup to use our own insurance – future item needed - will use shippers insurance to start 8. Email Function - customers tracking info, est delivery time, any delays – all channels 9. Need to have the option to print multiple labels for the same order. 10. Label needs to display what is on the inventory page but transit 1’s across the board to endicia/UPS for dimenisions 11. Auto-print labels hour/auto-sync every 15 minutes Inventory Management Module 1. Ties listings to inventory - I have a software I have used that I can refer you to so you can see what I want 2. Needs to have multi-location warehouse setup - I have a software I have used that I can refer you to so you can see what I want 3. Sync’s inventory across all channels to what we have in stock, if default location is 0 then it sync’s with secondary locations. 4. Invoices/Pack List need to display what we type into inventory page not how it is displayed on sells channel. 5. Need to be able to set up in inventory if an item needs to ship be itself. 6. I have a software I have used that I can refer you to so you can see what I want Re-pricing Module 1. Ties into inventory page and uses base cost from this page to determine max/min pricing 2. Needs to have settings where % can quickly be adjusted for max/min pricing based off of base cost. 3. Needs to re-price every 2 hours minimum Listing Module 1. Need to be able to add all relevant data on inventory page and be able to push this data out to all sells channels.