What @marinelife said. Sumatra.
If you have access to it, try Peet’s.
And if you have a local roaster, buy some freshly-roasted whole beans and a grinder for a much better experience.
I would definitely try some teas like Earl Grey, Darjeeling and Lapsang Souchang. Coffee is nice, but is pretty similar in flavors, whereas teas run the whole gamut of flavors.
If you decide to get really crazy, you might want to try some Korean Barley Tea
My husband loves Starbuck’s medium roast Colombian flavor and regular Dunkin Donuts. I try to buy it on sale, because it can be two of the pricier in the grocery store.