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There are two main species of coffee grown for commercial use: Coffea robusta and Coffea Arabica. Robusta has double the caffeine, but not the taste you expect from a specialty coffee. Think back to the worst cup of coffee you ever had while waiting in a government office, and you're probably remembering an over-stewed pot of Robusta. For that quality gourmet coffee taste you have grown used to at corner coffee houses, you'll want to stick to Arabica beans only.
For a selection of excellent Arabica coffee beans, try here, Gourmet Arabica Coffee Beans.