I use Gold Standard Whey Protein daily. I don't care for the Vanilla flavor. The Double Rich Chocolate is okay, but I really like the Chocolate Peanut Butter, Cinnamon Graham Cracker (blended with a banana) and the Mocha Cappuccino flavors. Haven't tried any others but the Chocolate Toffee Fudge and Rocky Road flavors are next on my list to give a go.
Atkins shakes are what I grab in a pinch - they have a sweeter taste than the powders. I'm partial to the ones with the coffee flavors, but the vanilla and strawberry are pretty tasty too in my opinion.
Hope you find one you like