product configurator custom

I'm working on a new site that is selling complex products. There needs to be at least two levels of decision making that effect the product configuration and the final price. I have experience running a general CMS with Drupal but haven't worked with UberCart or e-Commerce modules to know what would be best for this kind of product 'configurator'. Any advice in what module to use and how to build a product configurator would be GREATLY appreciated and would surely benefit the whole community!

Thanks in advance,
Scott