I would buy the first one that you come across that is in your price range and in good shape. My first was a repaint. The gal had no idea it was even a featherweight. She is a two tone of green from 1937 and in great shape. My other two are black, one an old lady from 1938, I think and the other is a Centennial edition from 1951.
I would really like to have a white one but will just wait till one pops up. I've found all of mine on Craigslist.