In a large bowl, beat the cream cheese, butter and vanilla until fluffy. Gradually add sugars; beat just until combined. Stir in chocolate chips. Cover and refrigerate for 2 hours. Place cream cheese mixture on a large piece of plastic wrap; shape into a ball. Refrigerate for at least 1 hour. Just before serving, roll cheese ball in pecans. Serve with graham crackers. Nutritional Facts 1 serving (2 tablespoons) equals 206 calories, 17 g fat (8 g saturated fat), 31 mg cholesterol, 101 mg sodium, 14 g carbohydrate, 1 g fiber, 2 g protein.