Variable prices per item?

I've just installed this onto my server and poked around the admin panel and forums...
I'm interested in using this cart to sell photography prints, so each item would have 6 variable prices, according  to size. 
I can't suss so far how or if this is possible. 

Any input or direction would be tremendously appreciated.
Thank you!

Select one sized photo as your base product with the price which will be your base price. It can be the smallest, largest or a middle size. Then create a product option for each size and set the price adjustment on each option to get the desired final price for each particular size.

You could also play around with this so that each option was the actual price for that size and the base price would be zero and selecting an option was compulsory. (if you are a php/html coder)

Your confidence is my confidence.  That sounds like a good direction to head.  Thank you.