You know very well maintenace cost on the Z isn't exactly cheap. $400 for rotors isn't all that expensive for slotted or cross-drilled. My suggestion is to either get the rotors turned down again for now and save up for the rotor upgrade. You'll need to replace the pads too, so take that into consideration.
The stock non-sport Nissan rotors are kind of crappy to begin with. My dad's Maxima, Murano and my sister's Altima all eventually had warped rotors. My Z had warped rotors at 9k miles, but the dealer turned them down for me. I will be upgrading to the Stillen or Stoptech rotors later this year (Maybe even upgrade to a BB kit).
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[09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R]
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