I am looking for a ecommerce site that allows the user to select from a list  going from a Category. Once in that category, The site will require the model to be selected, and show a picture of the part once, and then in a list show the available sizes and the ability to enter qty and Add to a cart for each size. This is for a metal parts manufacturing and distribution company.

For sake of description and detailing, I will use screws as the product example (this is similar to the products, but not the actual product).

Category would be Sheet Metal Screws, Machine Screws,  Wood Screws, Plastic Screws. Typically a user is looking into one of the Categories and not doing much with the other Categories.
Model - The Model Might be Stainless Steel,  Galvanized,  Painted, Aluminum. Carbide
Size - Size would consist of  Length, Width, and other dimensional or rotational details. 

This seem fairly staright forward, Fron what I have seen so far with searching for DNN commerce sites, most GUI commerce sites in DNN show Grid type displays and I am not sure if you can get into more specific infornation and sizing in more of a listing UI. I would like the user to click on the Category, and then have a list of Models to select with a picture, and if they click on it, they have the selection of sizes to put in the cart. The user might, want hundreds of one size part, and hundreds of another, so I don't want them to have to go back and forth between screens. Have all the available sizes and the ability to enter the Qty of each size and select Add to cart without going away from that size screen.

Category - Sheet Metal
    Model - Galvanized   - (Picture of Product shown only once)
            1X2.5 -XXX    Qty  ___   (Add to Cart)
            1X2.75 -XXX  Qty  ___   (Add to Cart)
            1X3.00-XXX   Qty  ___   (Add to Cart)
            Description and Sizes are completely listed here with ability to change qty and add to cart without leaving this page.

I am new to DNN so I am trying to figure out if what I see in the existing sites is the standard look and feel of the commerce package, or can I modify the look and feel to allow the lists that I have tried to describe above. Our thought is if the User needs to click more than 3 or 4 times to get to the part they need from the home page, they will probably not buy from the site. These are not computer people, and they just need to buy parts quickly and have them shipped quickly.

Finally checkout and connect to a Credit Card processing and a Merchant Account somewhere for payment.

What packages would be best for what I am asking for.  Does anyone have an exmple that I can look at?
With the ecommerce packages that exist, do they have the ability to change the appearance of the shopping area to what I want?

Thanks in advanced for any assistance.