Export to website: Part Number, Price, Description, Inventory
Import to GP: Customer Information, Price, Payment Information, Part Number, Quantity, Description, Price, etc.
Really just the basics. We want to feed the website our inventory on 15 minute intervals (I think it could be done with a server side script and a cron job). We then need to import the required sales fields back to GP.
I would like to stay away from e-connect for the following reasons (do not want to upgrade GP to newer version, cost, etc.) I would however consider e-connect if it can be done at close to the same cost as the other ways I listed.