I am looking for something like this - http://www.vistaprint.com/vp/ns/guid...av=HowToDesign

First step - there will be about 100-150 emblems to choose from. Second step - color changes. Third step - Text.. Final - Add design to cart.

I need to know how difficult this would be. What type of coding it would take? Is this ASP.net and how much time/pricing.