Small cog

I have just spent the past couple of hours researching these models mostly with information from Sheldon Brown with an eye to perhaps owning one at some point in the future and would appreciate it if someone could confirm that I have this right, ignoring components there are two basic frames the lighter weight chrome molybdenum models and heavier gas pipe models as we would call them if they were English, do Americans use that term? I would be more interested in the lighter models which I understand were made between 1962 and 1978 and it sounds like the 1970s models were more desirable.

I understand the lighter models are the

Superior,
Super Sport,
Sports Tourer,
Sport Limited,

The heavier models are the

Continental,
Racer,
Varsity,
Suburban,
New World,

Is that correct? They do come up for sale here occasionally and I would like to know what I am looking at when they do.