Muscle Milk taste good, but its loaded with sugar. Its pretty much a milk shake with protein powder in it. If you aren't worried about the sugar in it and just want good taste then this is what I would go with. I like Cookies and Cream.
I like Natures Best zero carb isopure.
50 gms of protein, mixes easily and tastes good.
It may not be the best for "bulking" but it's clean for those who are running a marathon and not a sprint.