I just created an AMAZING mix at truenutrition.com. I am severely lactose intolerant - as in eating a single milk chocolate bar is enough lactose to turn me into an airborne biological weapon of mass destruction. That said, the cold filtered whey isolate from truenutrition is actually 100% lactose free. I have tried other protein sources that say they are lactose free, but that only means they are 99.9% lactose free, which is still too much lactose for me.
Anyway, the mix I made is 85% Cold Filtered Whey Isolate, 10% Brown Rice Isolate, 5% psyllium husk powder, and I used the chocolate-peanut butter flavoring. It is, by far, the best mix I have made there. I think I will never try another. I did like the all natural banana flavoring also, but the problem is that it is made with real bananas that have been turned into a powder. While that sounds great, I end up with small chunks of reconstituted banana in my drink and that bothers me. If it does not bother you, I can highly recommend the all natural banana flavoring as well.