This is Ajay from portQii. As far as I know we are the only Oracle partner that has a solution for migrating assets from one instance of Eloqua to another.
I would be more than happy to give you a demo of our application and go over it's capabilities. This will allow you to ask any questions that you might have as well.
Please do reach out to us at www.portqii.com.
Is it possible for you to sharing costing when using portQii?