I just started using "Bioplex Pure WPI". The only ingredient is "Pure microfiltered whey protein isolate" - nothing added. Fat free and lactose free.
Interestingly, pure egg white protein (also offered by Bioplex) has a very similar amino acid profile.
I have tried both of these egg and whey products because they have no added ingredients. I'll wait until I finish the whey container before I report results for the battle between whey and egg protein, and if I notice any differences.