Staying NA is easy and plenty of options, since you say you want to track the car you should also look at brakes (pads, fluids, etc.). For performance numbers the best so far (ie you can buy today): Stillen Gen III intake, Berk HFC, and Stillen CBE.
Unknown items that are in production are Fast Intenstion long tube headers, Berk CBE, AEM intake.
Other items to look into upgrading with no clear cut winner in performance, pulley (Stillen or NonStopTuning), lighter flywheel, tuen (Cobb or Uprev). Since you have a Nismo you might like the stock suspension for awhile, but I can bet over time you will want to upgrade that also.
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