4 box advice

Right now I have a warrior, a rogue and a resto shaman in their mid 50's. I am using keyclone on 1 pc windowed. I'm not having too much trouble with positioning as I have bound my key so that when I attack with my warrior i hit sidestep which in turn moves my rogue (combat swords) forward and my shaman backward.

My question is I would like to add a 4th to fill out my maximizer screens and for PVE. I have thought about adding a warlock or mage or even dropping my rogue and adding 2 warlocks thus having only 1 melee and 2 ranged dps with my shaman for healing and totems.

I also had a thought about possibly adding another melee dps such as arms/fury warrior making my group 2 warriors, rogue and resto shaman...WF totem would be nice with this group. Drawbacks would be weakness to cleave and AOE, plus difficulty in targetting and positioning. But i kind of like the idea of everyone in my group being able to take a beating.

Has anyone on here multiboxed melee before?