If the new one has a warranty that is transferable (and most are) I would feel much better going that way. You're pretty close to the cost of a service so it may be a wash but who knows the history of the JOMA watch? Sold to several people and returned before you got it? (It happens from time to time if I read the "Look at my JOMA" posts correctly) or maybe, horror of horrors, the JOMA mechanics have already been inside it.
you'll forget the extra expense very quickly, but if it goes south you'll be miserable for a long time.