I am using the Classic Whey from Optimum Nutrition. It was on sale at GNC for 23.99 for the big bin. It mixes well and I like the taste. Although I took it back last week because it didn’t mix well. Every so often they make a batch where they don’t add enough lecithin. It’s good stuff, though. I’ve tried alot of brands and this is about as good as I’ve found.