I'm putting together a pricing calculator and am lost as to any intuitive way to design this. (I have the form built with ajax, so as visitors check various options, the pricing updated on the fly.)
We have the following as 'base' products: Widget A with Widget B, levels II or III Widget A with Widget C, Levels II or III Wdiget A with Widget B and WIdget C, Levels I, II, III
Then once one and only one of those 7 options are selected, there's a list of optional add-ons.
I supposed I could just radio button all 7 options, or radio button the three base levels and checkbox the 2 or three levels. But that seems like it's very confusing.
Worse, the levels I II and III are not the same thing for each of the choices (i.e. A with B level II is not the same 'B' as A with B and C level III, though it's very close).
Of utmost importance is to keep the choices simple. People buy on my site right now I think primarily because they're exhausted from the choices and I'm making it easy. This new product type isn't as simple as our last one unfortunately.