I`ve got to second Craig`s comments on focusing on specific products rather trying to sell everything to everyone.
I`ve recommended to clients with similar sites to first focus on the products they believe will be most beneficial for the business. That may be the products with the highest profit margin or the `hot` products that will be the most popular and bring the most traffic. Depends on your business goals.
Once you`ve selected that product(s) spend your traffic building efforts there first. Whatever type of SEO (website changes, articles, link building, etc) you are planning, you will be able to be more effective if you have a specific focus. Once you begin to see traffic for that product, move on to the next.
Another advantage of focusing on specific products is that you will likely be able to find cheaper keywords if you decide to do any Pay Per Click marketing. You`re going to spend a lot more on broad keywords like, `tv` than for more specific ones like `phillips lcd flat panel tv.`
By the way, it looks like you may be using Volusion for your storefront. I`m a big fan. They have a great product that gets great indexing results from Google. You also have lots of opportunity to put lots of the relevant content Google likes on each product page (description, specs, details, related products)
Good luck with the store.