For helms, I think you should include circlets of wealth (even jewellers so it has 3 socs). They have the potential to get more than CoT, and are the helms that can get the most goldfind of all, so they should be mentioned.
And even though there are many armor options, I think you should at least mention the theoretically best ones, that is CoH and fort. Although, I think CoH easily outclasses fort (CoH has +200% damage vs demons, +20 strength and +2 skills which boost might, so since council members are demons, CoH will give 240% ed, which is only 60% less than fort. CoH also has leech on the armor spot, and is safer vs conviction, and it even has some mf%).
I also think botd and such should be mentioned. It does have high damage. I don't really like botd on mercs, but I know many people do.
Also, how good of an idea is it to have a huge damage weapon on switch and berzerk phys immunes to death? I really hate walking around collecting gold with a council memember running after you, not letting you collect your reqard in peace and quiet. Or maybe just spellsteel or gavel of pain on switch is better since the merc can kill the phys immunes itself then, as well as increasing damage by alot vs non-immunes