Just now ordered four single boxes of light roast varietals from Fresh Roasted Coffee to test out which gives the best caffeine for the buck. They include Organic Ethiopian Sidamo (Fair Trade), Indian Monsoon Malabar, Congo Kivu, and Brazil Fazenda Santa Luzia (Direct Trade). I should receive them early next week, if not this week. Again, all are light roasts, and should contain oodles of caffeine. I'll let you know which gives the best taste for the buzz.
@leejackson Yes, that would be a good way to test. Enjoy!