I rolled a cleric, I am level 39 at the moment.
If you decide to roll cleric, all I can say is carry mana treatments with you, and I would suggest alchy as a proff if you dont want to just dot / melee mobs.
DO NOT stack pure HP manastones like all the higher level clerics tell you to while your leveling, do a mix of HP and magic boost, or it will take you forever to kill shit.
Rolling a cleric is not nearly as bad as you would think it is, actually alot of fun... esp once you hit the abyss.