Seems to me the cost difference (at dpsnutrition.com, atleast) is a mere few dollars between any of the major brands. I suggest you try several and go with the one you think tastes best/works best. I used a couple scoops of the Optimum pro complex, and well, I'm giving that away. I like the Sportpharma complex, though, both chocolate, of course. I'll use that one. I tried mixing them, BAD idea. That made the bad optimum taste worse. I'm going to mix Sportpharma with Designer later today.
-B