Here's the link to my favorite recipe.
http://allrecipes.com/recipe/best-ever-banana-bread/
Of course, I don't follow it exactly...I use 1/2 white sugar and 1/2 brown sugar and add a handful of coconut (toasted coconut is really good in it as well). You don't really notice the coconut but it makes it really moist. Sometimes add a bit of cinnamon and nutmeg as well. As an aside, did you know you can store frozen buttermilk so you always have it on hand? I use buttermilk for 2 recipes so when I buy it, I portion what I use and freeze it in a snack sized ziplock. Defrosts pretty quickly in water (as long as your bag doesn't have a hole in it...don't ask how I know that!)