Next time you're in the shop, ask for the Sidamo. I am roasting it very lightly, only a touch past first crack, but the flavor is amazing. It has the kick of a coffee roasted far longer, but the complex earthy flavors are still clear and present in the initial sip.
I tried it with a heavy roast and it just did not taste right. In order to figure it out I decided to start at the beginning with as light a roast as possible, and then work up from there to find the sweet spot. Turns out the sweet spot is right at the beginning.