So you only have a base model no sport package? If so just go with this package from Z1 and be done with it. Very affordable with many options. I'm currently running on these rotors and there great. I have 6K miles and three track days with no issues or stress cracks yet. Please tell them Christopher Spohn sent you.
Don't get drilled rotors though.
Z1 370Z / G37 Brake Upgrade Package (Non-Sport Models)