My favorite is white chocolate. Lindt makes white chocolate truffle bars which are very tasty. I stock up in bulk when they are on sale at Walgreens.
I have to mention that my weaknesses are truffles and chocolate mousse. When it comes to truffles it doesn't matter if it's milk, dark or white chocolate as long as it's ALL chocolate and good quality - See's, Godiva or Shaw's. When I dine out I usually skip dessert except when a chocolate mousse is offered. Then they can just leave the cart and keep an open tab on my card.