Preheat oven to 300°F. Grease or spray a 9x5x3 loaf pan. In a large bowl, mix together the eggs, agave nectar, honey and oil. Use a mixer or beat intensely by hand. Mix in the coffee and orange juice concentrate. Add in flour, baking soda, cinnamon and any optional spices. Mix on a lw speed until blended. Increase the speed for 1 minute near the end. Pour the batter into the pan and bake at 300 for about 65 minutes or until a toothpick comes out clean. Cool the cake before serving.