Multi Channel Order Management


We have been using CS Cart since version one, have an ebay and amazon shop and have for a long time struggled to find a good third party system that integrates with CS Cart and ebay and Amazon.

Looking for a system that can help with processing orders, ie courier selection, label printing,

The systems that are out there that can work with CS Cart are either over priced for poor feature set or US based and do not work with UK couriers. ( or some other vital part missing) Does any one have any suggestions for a good platform to use?