Peugots are going to be nearly impossible to tell models apart on. I'd scratch them off your list entirely unless you really know what you;re doing, and if you;re asking this question...it's better to leave them be.

Eighties Miyatas typically have a 3 digit model number...like 916...generally speaking, the higher the number, the better the bike's components. A 1xx series will be entry level...a 9xx series will be high level. If it says 1000, Team, or Professional...BUY IT.

I don't know much about Fuji models.

Avoid Motobecane for the same reason you avoid Peugot...unless you know what you're doing, it could get ugly.

I THINK (and could be totally wrong) that Somas from that period are crap. Same with Huffys...unless it's a rebadged Serotta, and it won't be.

Of the Schwinns he mentioned, none are especially high end and all will be fairly heavy. The Super Sport is the nicest, but he's singleing it out, so he'll want real, probably too much, money on it.

My guess is this stuff will be almost all low end entry level stuff and probably priced too high. He's pointing out the Brooks, so he knows something...and he's mentioning some very blahhh Schwinns. That leads me to believe none of this is especially desireable and he knows enough not to give things away. My guess is that if he had something of note, he'd know enough to say it.

The following is a GENERAL guide and isn't always accurate...but it's helpful and is often accurate...

If it has a kickstand, it's probably low end
If it weighs over 27 pounds and isn't a touring bike, it's probably low end
If it has suicide brake levers, it's probably low end
If it has shifters on the stem, it's probably low end