I am on a low carb diet, so I look for shakes that are lower in calorie and carbs. So, the ones I drink might not be suitable for your needs. (I noticed that the ensure has 320 calories). Anyway, with that caveat, I like the Atkins Cafe Mocha shake. It is very rich and creamy. 160 Calories.
Started out at 405.5 on 7/31/12. Then lost 156 lbs to get down to 249.5 by 7/31/13. In the past year I have put back on over 40 pounds and reached a high of 291.5. But I have recommitted myself and quickly took off ten pounds by 7/31/14. I am now trying to take off the weight I put back on, and then the rest of the weight I was originally trying to lose. Hopefully in the next year I'll get it done.