I'd say Raleigh Grand Prix and Schwinn Paramount were really popular at that time, probably good for finding at yard sales now. I don't know a lot about vintage bikes, but I think it's harder to find parts for French bikes, so consider that if you find one that needs a lot of work. Also be aware a vintage bikes can cost as much as a new bike to build, if it needs a lot of parts. I learned this on my vintage Merckx, but it was so worth it. It's a great bike.
Here's the place to start:
http://www.sheldonbrown.com/vrbn-a-f.html
I think the price guide may be outdated, as Sheldon passed away few years ago, but it gives good info about brands.
'02 Eddy Merckx Fuga, Selle An Atomica
'85 Eddy Merckx Professional, Selle An Atomica
'10 Soma Double Cross DC, Selle An Atomica
Slacker on wheels.