* Priest heal spells should do more healing with less lag
While that would be awesome... I think the lag -needs- to offset the healing to balance the spell. What? I'm at least open to making heal spells balanced and not just stupid OP restore everything so you can never die unless you run out of mana.
Power heal is, obviously, the strongest heal I can do... I think the lag is -a little- bit much. It could do with some lowering(maybe a seconds worth, tops), on top of lowering the mana cost some(500 a cast, even at level 269, 250 if sorcery or whatever procs). On the flipside, lower level heals(cure light, cure serious, cure critical) could use a little buffing for lower level priest play. As they are, they're not even worth it, even GM'd and with a divinity rune. Heal is nice, could perhaps use a little HP buff(it's useless without divinity rune, which is another problem altogether).
Beyond power heal, the only spells I know of that beat it are divine healing--which would be the example of an unbalanced heal--and restoration. Restoration .... might be unbalanced, and it might be balancedish. It requires a spell component, costs 2000 mana, and fully restores the target... according to Belrath, anyway. Divine healing, however, costs like 50 mana, has barely any lag, and easily heals 6-7K with divinity(power heal is usually about 5-6K).
Other problems priests face, is a lack of offensive options. Which might be resolvable with lowering mobile AC so they can hit with melee attacks(how few we get), but priests would still need some help. Skill damage needs to go up, definately(kick, bash, palmstrike), and priests -really- need some offensive spell help. I know priests aren't supposed to be mages, but, even in Final Fantasy, white mages usually get -some- kind of -good- offensive spell(Holy). Priests, unless you go with the pastor side of the tier, really only have four offensive spells they can rely on. Harm(ironically, cause critical is stronger...), ray of justice, blackfire and dispel good/evil. The last of those four is actually a multi-hit spell, which -would- be promising if its damage didn't suck at higher levels. It's alright at low level. Harm/Cause crit is a one hit spell that might do around 800-900 damage. Ray of justice and blackfire might pop 300-400.
And... that's pretty much the extent of a priest's options for offense.