Tried many different brands of dark roast coffee. Tried Caribou Mahogany about two years ago. Been my go to ever since. Prefer my k-cup to coffee shop brews.
You really can't go wrong with Caribou Coffee. The Mahagony blend is good -- and I'll likely order it again -- but it's just not as robust as Obsidian. In a pinch, Mahagony serves me well.