Two prices for one product

I have a product that is a photo which comes in two different sizes so it has two different prices associated with it. How can I set it up so the user can select which size/price they want and then the quantity they require.

Two choices, and they are worth thinking about from your customer point of use view.

1. You may find that to make the selection easy for your customer it might be worth actually having two products, the large and small photo easily seen on the product page seperately and selectable then.

The below products could have been a dropdown with 5 options, but I felt it was better to be able to break them apart for viewing and descriptions :
http://oceansafety.com/leisure/category/57-safety-packs.html


2. You can have one product with a drop down characteristic (like below link)
oceansafety.com/offshore/product/1435-mi...rness-dual-tech.html

Which would you like

The first option is not a good solution for us because we have so many images. With the second option not really sure how that would work either. How does it do the quantity and price