What companies to study?

Okay, so now we have defined 'Corporate, Social, Responsibility', the next step is to decide on what company we want to research.
We find it interesting how just to include CSR into their brand awareness so many companies are willing to cut their income. Companies such as Starbucks do this by using ethical coffee beans. These beans cost the company more than the usual coffee beans, but by using these beans it gives the brand an ethical, greener image and will last longer in the memories of the customers when they next buy a Starbucks product.
Another example of this form of CSR is being used by Energy Suppliers. Therefore Energy suppliers will the be the focus of our research.