To correct you on the seats Andrew, only series III have the red inserts and stitching, series II are the same as series I . Steering wheels and H/unit surounds are the same in II and III , h/unit surounds are slightly different on series I, s/wheels totally different on series I.
The g/boxes are said to be different as well but i never had one stripped .
Another little difference , the passengers side blinker grill has a slot in the III, not sure if its only on V-specs though.
Series III has a rear fog light an the drivers side instead of a reverse light on the earlier mods.
Of course the main diffence is the projector xenon h/lights. Omurru you cant buy them for $2 k from Nissan mate .
If i was buying one i would prefer a series III V-spec.