Joomla! Dynamic Drop-down Order Form

I need a dynamic drop-down order form for Joomla! 1.7x that will allow users to choose options, that will lead to other unique options with each option adding to the overall price of their order. For example, the first option name might be "Theme". Under "Theme" there is three options - "Theme 1" "Theme 2" and "Theme 3". If the user chooses "Theme 1" several unique options will appear for them to choose from - "Color" "Graphics" etc. Each option they choose with increase the total price. There also needs to be the option to choose one or more of each option - maybe the user wants 2 of "Theme 1" or "Theme1" components. The form will need to calculate total cost simultaneously as the user adds items. The user needs to be able to de-select any option they decide that they don't want before they finalize their order. The form should have PayPal functionality that can be toggled on or off. The form must be developed with security in mind including form verification, SPAM protection, hidden fields, etc. I was looking at using [login to view URL] , but I am not a coder and can not get things to work the way they need to on my own.