I just found a new favorite ----
Dymatize 100% Iso whey. Its all 100% WPI, nothing else, mixes pretty thin, even with a shaker bottle. Its the best tasting I've had by far, a little more cocoa-like vs. a fake chocolate taste. 25gms protein per scoop, no carbs, no fat.
I found 5 lbs for $40 at my local store. Not a bad deal at all.