I made this truffle recipe, except I substituted dark rum for the brandy the recipe calls for. They turned out divine - I coated them all in ghiradelli cocoa powder. I was able to buy 60% (bittersweet) discs for the ganache centers, then good quality semisweet chocolate chips for the coating (right before the cocoa dusting).
It was a messy process, but WOW did they turn out great.
http://www.foodnetwork.com/recipes/alton-brown/chocolate-truffles-recipe/index.html