This is really a question of personal taste. Choose good quality, fresh coffee to start with, make the coffee, then try it. Try a range of different coffee flavors to see which appeal to you most. Keep notes on what you like in a coffee (nuttiness, bite, aftertaste, earthiness, etc.), which regions produce the coffee you like the most and which you would love to have often. Then it's just a case of making up your mind and choosing your favorites each time.