Depending on what you are using it for, a protein blend could be much more effective.
There was a study conducted at Baylor University where one group of individuals was given a whey-only PWO shake and the other group was given a whey/casein blend. The group with the protein blend gained an additional 5 lbs of lean mass over a 10 week period. This is most likely due to the different digestion rates of the protein which give a time-released effect.
There are plenty of options out there in terms of protein blends; in fact Optimum even makes one - although I would probably go with another brand. The GNC brand is another one that I would not choose if other options are available.
In terms of flavor, if you do decide to try Optimum Whey then I would suggest the Rocky Road flavor.