For the option selection, the value of the radio button should be the option ID.
when working with incremental pricing, you need to pass the option id to a recordset to look up the selected option, then [ass the option name and price increment from the recordset to the cart.
If you want us to help implement this, we can help through a premiere support appointment:
http://www.webassist.com/premier_request.php
When you sign up, we will contact to set the appointment and can give a better idea of final cost at that time.