I find I do best with a blend that is whey concentrate and isolates, if it's just concentrate it tends to make me gassy like Derek.
What are you getting the protein for? I know Lyle Mcdonald usually gets milk protein isolate or whey concentrate. He also recommends getting the BSL flavors and not the regular flavors with Stevia as a sweetener.
Hope this helps.
"And for crying out loud. Don't go into the pain cave. I can't stress this enough. Your Totem Animal won't be in there to help you. You'll be on your own. The Pain Cave is for cowards.
Pain is your companion, don't go hide from it."