Lots of good advice.

No one has asked the most important question. How do you like the sound of the banjo? When you simply strum the open strings, how do you react? Do you think "YES!" Or are you vaguely dissatisfied. Too loud? Too soft? Too metallic? Too thumpy?

No matter how good it looks or how mint its condition, you've gotta like the basic sound. Playing a banjo requires you to get really intimate with it for long periods of time. Do you think the relationship will last.

Next important question. How's the action? Does it play itself. Do you have to fight it? Will it be a relationship of mutual support or an adversarial one?