I tried a cleric up till lvl 65 when I realized that for all the SP I spent, it didnt help as much as I would have hoped. My reason was this; more often than not, I was hit when casting bless or heal or recovery division. Even if I got them off, it turned me from a 1 hit kill to a 2 hit kill at most. So from 65 to 68 I did cursed heart quests in order to get myself leveled up as a bard. Now at lvl 76 I havent looked back. The extra speed and the Noise buff are all you need to stay alive in most situations. But still its best to learn to pick your fights, because now you are a 1 hit kill
On the plus side, wizards level very fast and are fun to job with once you get the hang of it.
enjoy