Pista Concepts have had their popularity but if you want to say something was the gold standard of aluminum track frames (at least ones primarily ridden on the streets), it is probably the early 90s Cannondale track frames. 15 years later and people are still trying to find them. Plus, they paired the aluminum frame with a steel fork.

OP, if you still live in Jersey City, just head over to Continuum Cycles in Manhattan on Avenue B between 12 and 13th Streets. The shop owner designed his own aluminum frame (also paired with a steel fork). He also stocks or can get Moth frames, another aluminum track frame.