You're safe sitting at 54 on most crafts for the cross-class skills. That being said, 51-60 is the greatest investment of both time and gil you'll need to level them, and 60 onwards isn't much of an investment, in fact if you level a certain way you can either make gil, or save gil if you end up melding.

Bearing in mind specialist is current useless so I don't find much use in overthinking, though personally if I had to say my answer would be ALC, primarily since in your case I could make the weapon I need, and craft myself consumables, and also sell crafted consumables, which on more prominent raid servers, will sell like hotcakes