What's good depends on expectations and how much you're willing to spend. A Bob Jackson World Tour would do nicely, but might be a bit over your price range.

Oftener than not it isn't economical to swap components. There typically will be unforeseen costs and compatibility issues with the seatpost, BB, etc. IMO you are far better off searching for a mid 80s era touring bike complete. They often sell for pennies on the dollar compared to the original prices.

That said, the main thing with vintage is to take advantage of whatever opportunities present themselves, so if you find a Univega Specialissima or Miyata 1000 frameset on craigslist or whatever for cheap, buy it!