Dymatize Elite and PVL are two of my fave brands.
Right now I've got the Dymatize Butter Cream Toffee. I mix with water (mixes really easily too, with good flavor). Add in a tablespoon of chocolate SF Torani syrup and it tastes like a liquid Heath bar.
I've even been making the occasional toffee coffee-chino lately. Just mix with iced black coffee instead of water.