Sounds like a good price, depending on the condition of course. Are you getting a trailer, wheels, box, and other gear as well?

Many have sailed this boat solo but as with any cat designed for two, it will be a handful when the wind picks up. Many H-20 are rigged with furlers for the jib which is helpful.
HAving never sailed a 16, I can't make the comparison but there are more controls on the H-20, and daggerboards.