Hello "byoung86",
1. I would recommend you to optimize the name and purpose of your product as keywords on each product page.
2. Don't stuff too many keywords on the same page. Optimizing 2-3 main keywords on each page is the optimal.
3. I suggest you to create separate pages on your ecommerce for brands, especially if you are going to have 200 brands as you said, and there you can include your product's brand name as keyword.
Hope that helps!