You probably want to clarify what you'll be doing. 1/4, street, autox, and what sort of tire you are willing to run.
Also, how much you are willing to spend on the rear diff. The stock isn't going to take much abuse, and on the high end the R230 is pretty spendy.
I won't be able to help you on the hp / tq question though.
Wish I had the Z experiance to be able to though