I love a strong cup...but for me, all the dark roasts I've tried tended to be on the harsh and bitter side. Just my peculiar taste buds, I'm sure. I found a very rich and bold medium-roast bean that I like very much. Southern Weather, by Onyx Coffee Labs - based in Fayetteville, Arkansas...but they ship everywhere.
For me, the secret was learning how to brew a good cup. For years, I didn't realize I wasn't putting enough coffee in the filter. SCA (Specialty Coffee Association) recommends a coffee-to-water ratio of 1:18 - or one gram of coffer grounds for every 18mL of water. When brewing a whole pot, my little drip coffee maker can't do that because the brew basket isn't big enough to hold the recommended amount of coffee. But it does outstanding on half-pots, where I can get the ratio correct.
Red