Reccommendations for Protein Powder

You'll probably just have to try some for yourself. I've used several of the big brands, and some of those have two or more chocolate flavors. I'll get whatever is on sale (slickdeals alerts), whether Optimum Nutrition Gold, MyProtein, Muscle Milk, Dymatize, Muscletech.

Check the nutrition before purchase. Aim for at least about 70% calories from protein (remember that protein is 4 calories per gram). So if it says 24g protein in a scoop, calories should be at most about 140. Lower is better, ofc not that big a deal if you plan to load it up with a lot of calories from milk, fruit, etc.

I often put chocolate whey into my pancake mix, which is mixed with milk not water.

Btw, unless you have gastro issues, you don't really need isolate, and it will be more expensive. You do get slightly higher protein % though.