you guys that use the penta pro should really consider going with a custom blend that doesn't have soy in it. that shit is horrendous for you.
i usually just buy one bag of whey isolate and one bag of casienate. then, depending on which meal it is (early morning, post workout, evening, etc) I will use either one or the other or a blend of the two. You want fast absorption in the a.m. and post workout (isolate), and slower absorption during the day (blend), and the slowest possible absorption right before bed, (casienate).