Culinarian because fish are cheap and if you fish chances are that you have a lot of high levels sitting around that can convert to rare swimwear that you can sell for a lot of gil.
Alchemist because every titan weapon and most of the other primal weapons can be desynthed by the alchemist, leading to greater high level materia chances.
Leatherworker because it makes money. Get to the stage where you are able to farm the garleans for their masks while leveling your new black chocobo and you can desynth those for a high chance at a battlecraft demimateria II, which sell well.
Good idea about crp though. I did not consider the cheap high level furniture
Edited, Aug 22nd 2014 8:28am by Valkayree