At 5'10" you will need at least a mediumlarge sized frame (18" to 20"). Some of these Craigslist bikes are clearly too small.

Beyond that, you should budget another $100 to $150 or so for parts and labor as some of these bikes are really old with unknown history. At minimum, most older bikes will need new chain, freewheel/cassette, cables, brake pads, tires and tubes. And budget for labor if you plan to have a bike shop do the work. If the used bike is decent, it is still money well spent.