If your planning on being a full healer, then get every heal spell.
as for bead of healing, at higher levels it is very, very usefull, as it has 2 beads that heal the same ammount for a low mp cost, plus you dont have to be anywhere near the action.
also i noticed for bead of healing, if 2 people are right on top of each other, they both get healed by it
eir is defiently designed to be both a healing class and a damaging class, remember to pick and choose your skills carefully!
in order to max every skill, you have to be lvl 171