I personally use the Pro-Blend 55 from HDT. This stuff is awesome.
And, your friend is right, a quality blend protein can be taken PW or anytime for that matter.
Here is the ingredients list from the bottle:
Ingredients:
Micro Ultra Filtered Whey Protein concentrate, Egg Albumen, Calcium Caseinate, Micro Ultra Filtered Whey Protein Isolate, Ion Exchange Whey Protein Isolate, Hydrolyzed Whey Protein Isolate, Natural and Artificial Chocolate Flavorings, Acesulfame Potassium, Stevia Rebaudiana.
I feel a blend is the way to go for a longer feeding after ingestion.
PN