I've tried many varieties of Meal Replacement/snack bars and I enjoy the Balance Gold, most flavors of Luna Bars, Kashi Chocolate/Peanutbutter (have to hide those from my 13 year old), but my two most favorite are:
Lean Body for Her Mint chocolate (tastes better than a York Peppermint Patty)- 1.76 oz, 200 cal, 5g fat, 11g carb, 16g protein, 7g sugar and,
Designer Protein (Chocolate and Expresso flavors)- 2.7 oz, 260 cal, 4.5g fat, 6g carb, 30g protein, 2g sugar.