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Both technosquareinc and alteredatmosphere do ecu flashes for the 2003 ecu's. I don't know if anyone makes a chip though. I am driving down to alteredatmosphere for a flash this Saturday. There's probably going to be several 350z there.
I don't think there is one in NJ. Closest I've heard about is 8011 Cessna Avenue - Gaithersburg MD, 20879. That is Altered Atmosphere. It's just a flash (reprogramming your stock ecu not changing anything physically). I am not really looking for gains but rather more driveability but I've heard 5 - 10 horsepower.
When I ordered some oil for my popcharger from Wolf Technology they told me their ECU should be ready sometime in late December. Will have to wait to see what it will do.