If I were you, I would go for the 14 week. That's still an extremely trainable period and you won't have to deal with taking him out every 30 minutes, etc. House training will be easier, teaching bite inhibition will be easier, and like you said--he already has all of his shots.
By the way, I hope you're going with a reputable breeder. We can help you find one or tell you if yours is responsible.