Your post looks a lot like a "wanted to buy" ad..
Value is subjective depending on perceived brand reconginition, condition, demand, supply, what you are comfortable paying and what the seller is comfortable selling at.
Price of 1980s anything can range from scrap prices (couple of hundred) to tens of thousands..
AS enjoys a huge zombie like following so used prices reflect that and does not necessarily imply or mean they are better. They have that cool "retro look" from the 1950s but at the same time, that design limits what you can do with the rig to pull it into the 21st century like slide outs and even interior..
HRs and Aluma-lites do not enjoy the zombie like following, sales of those most likely were considerably less when new meaning many less of those out on the used market.. Less means the small following that may be out there is holding on to them because they love them or because they are trying to squeeze the highest price out of them.
What ever you decide, look it over and look it over very hard, they all can suffer from water damage (yes, even AS units leak) and at that age you will be looking at full blown restoration will be in your future..