I'm sad to hear that you don't want to make ToD end rewards complete. I guess any other new class is equally screwed, such as the one to be introduced later this year. I guess putting them in a different quest would be ok, but they should really spread out all the rings then. Want shintao? Run newquest1! For frenzied berserker, run newquest2!
Ideally, you guys will look at usage rates and desirability of the different sets and their effects because the ToD sets are all very far from equal. If each ToD set were best in slot for its respective prestige line, that would be fantastic, but as of right now, they are not.