Word of advice. Find monsters that have low defence and attack with decent amount of hitpoints. Do not think of leveling at Ankous, Cockroaches. They are horrible xp and do too much damage to be good training monsters.
With your stats, I would say zombies in the room before the north flesh crawlers. They are similar to spiders on the 3rd floor of the dungeon. Other monsters: Hobgoblins (if you ignore the limp drops),Hill giants(meh), Lessers(Meh),