I am sure that @jp will chime in soon, and he will recommend a good brand or place where to get unflavored protein, because if I am not mistaken, he uses one.
Sincerely, I have always had the same problem as you do - it is very hard to find a protein with a balanced taste to it. However, I would also recommend you to give wheytobuildmuscle a try - this whey isolate has a very good taste to it. I personally just love the Colombian Espresso, as it tastes like one great coffee drink.