(I'd like to first state that Diablo III is very fun. While there are certain design decisions I disagree with, the game on the whole is fantastic. This
is not a critique, it is only thought experiment for my own amusement)
Each of the 5 classes in Diablo III has its own (theoretically) unique resource to manage. However, more could be done to distinguish them. I'd like to go through how the classes currently play, then propose some alternate resources. I'll be paying closest attention to providing each class with its own unique play experience.