Dulak has steady experience and decent loot (though I've been told it's a bit less than it used to be). Because of wanderers, it'd be best with a partner.
My husband's a beastlord and I'm a magician. We pretty much lived in the shipbuilder's yard for a few levels, then moved into the hidden tunnels. The exp wasn't phenomenal but very steady and pretty safe.
Another place you might want to try is the Grey, at the base of the pyramid. This is an airless stone, so summon a lot of waterstones. Invis up and run out there. Once your inside the broken walls around the pyramid there are no wanderers. The mobs at the base of the pyramid are static spawns. While you're killing the shissars, you can collect their organs to do the quest for this handy item:
Amulet of the Grey Wastes.
Again, this would be best done with a partner but probably doable solo.