1984-Anniversary year of all 300zx, however, there were some Z's that were the AE (Anniversary Edition) these had ajustable shocks, body sonic amp, leather, digi dash, as well as other goodies.
Some dealers would sometimes put AE badges on non-AE cars, so check for all these things. (they also had a cool two-tone paint)
1988-Shiro Special, only 1000 made.
Came with VLSD, Recaro seats, analog dash, no options, white wheels, euro front air dam, t-tops, 5-spd...
These also weighed 200lbs less than other Z31's, so I guess you could say it was the fastest.
(205 hp on 3020lbs)
I have a shiro btw