Eh, level until you're comfortable with the fights on the upper levels. Even with all my years of RPGing, a boss fight can turn horribly wrong when your healer drops.
LOL, course 4 years of FFXI proves that too.
A level or two higher can make a pretty big difference. Just hope nobody ever runs into what made me quit FFIV for years before returning to it...
(
stuck up near some bosses that kicked my butt, and I was saved right outside em, no tents, no cabins, etc. No real way out.. sucked!)