I've thought about the same thing heres what i came up with...
Harmony ring ....kinda nice to have but once you get to higher lvls you'll have to up it too which cost alot of sp +theres always pots
Ress skill....well I got this but i didn't know that you had to up it to ress high lvl players...like i can't ress people lvl 25 cause i never uped it and i'm not planning on doing it anytime soon
One good thing is the extra MP you get from force = ]