My favorite "straight" coffee is Dunkin Donuts. My favorite flavored coffee is Barney's Cool Cafe Blues. We buy the Dunkin here, but they closed our Barney's, so I have to buy it online.
We use a Keurig and have a basket insert so we don't have to buy the K-cups. We keep a Brita pitcher full of water to fill the coffee maker because our water has some flavor to it. Try using filtered water and see if your water might be the problem.