New player with lots of advanced questions (LONG)

[Economizer]

As for myself, I have no interest in capping Thief, and will likely jump ship the moment Blue Mage or perhaps Beastmaster becomes available to me. Felt like that was a detail I should have mentioned before @_@

Those should also work well (both very powerful options), although capping THF has benefits for Treasure Hunter and farming as a job you can farm with.