Need help with ideas on ecomm integration

Hi -- I'm trying to determine the best way to implement a Paypal solution for a photography website. The form integration seems straightforward enough. The challenge is that photographs are sold in multiple sizes with multiple options per size.

The experience I envision is one where selection of print size and options is separate, with the price computed properly based on the selections.

Ideally, I'd like to create a 'pricing page' the photographer uses to enter dimensions, options, and pricing. Then, on each photo page (same thing as a product page), the photographer has the ability to select sizes/options for that photo (sizes, options, and prices vary photo).

Any thoughts on how to accomplish these things would be great appreciated.