Not to snub your post request (welcome to the forums, hope you stick around) but how about doing searches on values of both bikes complete. That's the best starting point. Prices will vary according to region and bike condition, of course. You will also find specs that you can compare, that helps with your decision to a degree. When it comes to pricing bare frames, you will discover the challenge of finding what you want in the size you want. The pricing on frames for 80's bikes can be quite affordable for a starting point of a build if you go that route, but finding the nice Columbus or Reynolds 531, Vitus, Tange etc will be more difficult and priced accordingly.

Hope that helps some.