Hey Daniel,
I think you should have posted this thread in the e36 section of the site where you could have gotten maximum benifit of your particular model.
Do you want your car to be quick of the mark (bottom end) or would you like it to gain better top end? both ways are expensive and could lead you into more problems than you care for.
For a guy that doesn't have much money have you considered chipping?
Welcome to the board, I also am from Australia (nsw state)