Since no one else will give you a serious answer...
I would suggest using GW Cultist models. You will have to special order them from the classic range of chaos minatures either in the new bits book or on the website. They are metal but can be converted with greenstuff easily enough if you choose to do so, and also they are GW minis so you don\'t have to worry about a DQ if playing in a GW sanctioned tourney.