Wizard would be the best by far because:
1. It is able to 1 hit any monster your level and it can tank once you use bless spell from cleric
2. You're basically standing still when grinding on european monsters..just 1 hit everything within range
3. You're only using MP potions; no HP required almost...on my wiz/cleric HP pots are not needed....if you get hit..heal with cleric..on giants..cast a bless spell..on PT mobs use a healing cycle...only need 2-3 pots per hour of grinding
4. Your kill ratio will be extremely fast which gives you better chances of getting item drops
P.S. get a squirrel
