1. $600 for that bike is beyond ridiculous.
2. Look for a vintage touring bike with cantilever brakes. I have sold several in the last few years, none went for this type of money.
Around here, nice vintage touring bikes with cantis in beautiful, ready to ride condition, go for $350 to $400 (look harder, and you can find them for less). There are a couple of rare exceptions that bring more $$: Miyata 1000, Trek 720 and a couple of others.