I liked FFVs job system of make whatever party you want. Combining that with characters that have unique abilities/skills that can change and evolve with the base job they are would be my ideal 'job' system.
For example, David the Bard starts off as a bard, and is quite skilled as one, but can be changed to whatever job you pleased. He is skilled musically though so does bonus damage with harps, flutes, bells, etc. So he would work best as a bard, summoner, monster tamer, blue mage, etc. Maybe as a bard his singing boosts party attributes but as a summoner it strengthens the attack of the summon. You get the idea?
That what you were getting at willard?