Is Drupal 7 a good fit for my site? I started creating my site in Wordpress 3.1, and I have hit a speed bump. I am considering switching to EE or Drupal 7, in hopes of achieving my vision of the site.

The problem I am having is excluding terms in the dropdown menu query. Currently I have taxonomies for CarMake, CarModel, Year, etc... My problem is when I select Honda, the  menu does not exclude non Honda cars, so you get a giant list of car models.

The search menu then would return all "posts" that include those taxonomy terms in the "Videos" custom post type. Each "post" was essentially a blog post with a very short description and a youtube video.

Before I invest countless hours learning Drupal or EE, I would like to find out how hard this menu/search would be to implement. An example of the menu I would like to re-create is here
The Hierarchical Select module does exactly what you describe. Here is a demo that even uses car brands as the example.