For easily accessible and great flavored coffees you can make at home you can't go wrong with Starbucks. I refuse to buy a cup of coffee from their stores because it usually tastes burnt, but as far as buying whole bean from the store, it's some of the best coffee out there.
The best thing about Starbucks is it's not too expensive and they have a very extensive range of different beans from across the world, so you get a chance to taste many different types of coffee.
My personal favorite is in line with Laura, but what she posted a picture of is only a Kona blend, not 100% Kona coffee. Kona coffee is world renowned as being one of the best coffee beans out there. The hardest part is getting ahold of a bag of pure Kona from one of the Kona plantations on the Big Island of Hawaii. Recently there have been many new companies who sell 100% Kona so it's really hard to tell the difference between the good and the bad ones, and honestly, I'm still trying to work that out.
My best advice for anyone who wants to enjoy good coffee not named Folders or Maxwell House is not to cheap out. Buy a nice coffee maker, a sturdy grinder (not the grinder/brewer all in one, they suck), keep a stash of filtered bottled water, and go buy some good coffee. Sure it's a little more expensive than buying a shit coffee maker from Wal-Mart and drinking Folders every day, but it's totally worth it imo. I love coffee too much to cheap out.
edit: Also, I'm glad you only drink your coffee black because that's the only way it SHOULD be drank. Anyone who puts cream and sugar or anything other than coffee in their coffee is an asshole. Fact.