I just recently drilled up an agent and it is a great rolling ball. I punched it up 3, 3/8 by 3, 3/8 and left to box finish on it. It gets through the lane very well with a nice smooth backend. As far as your question is concerned it would be difficult to classify either the paradigm or agent in between your strike zone or classic. The agent and both zones have basically the same weight block with different covers. And the paradigm is going to be stronger than all of them. My recommendation would be to purchase a paradigm or even a paradigm passion and use your strike zone as a medium ball and classic zone for when they start to dry out some. I have thrown all three (agent, passion, and paradigm) and all of them roll very well.
Good Luck and Good Bowling,
Michael