Hi all *wave*
I've got a free download book from
www.wizards.com that names the Council of Six (it's called 'Lands of Intrigue' and has a fair bit on Amn). Apparently they are/were:
Erlranther Alibakkar
Phaan Colwyvv
Qar Jysstev
Rhinnom Dannihyr
Tyrda Q'Helvor
Pehllus Tanislove
So there you go ^_^ Nasty bunch actually, four of them are some flavour of evil.