Joomla/VirtueMart Shipping mod

Basically this is what is needed: 1. A shipping module that includes the ability to manipulate both local and international shipping charges per individual product and/or per individual category. (International shipping can be a separate module if that would work better.) International could be inputted as percentage of increase based on standard shipping cost or can be inputted as a fixed amount whichever is easier. 2. Input of shipping cost should be per individual product and/or per individual category. 3. Shipping cost needs to be visible throughout the payment process as well as on the final invoice. 4. Modules must work in conjunction with current, Virtuemart available, payment methods. I am currently using PayPal. Currently our vendor provides a shipping cost per product so we are attempting to do the same so as to not overcharge or undercharge for shipping. We are open to suggestions that will make this project or the site better. It is important that this/these module(s) are operative and compatible with at least Joomla 1.5 for a future upgrade if needed. Less than 100% of this project being completed will be a breach of contract and therefore will not be paid or not paid for the full amount (based on circumstance). 100% completion of this project will guarantee any future work with this site will first pass through you.