Chaos knights for me would be a must i don't think many armies would be able to deal with them quickly at 650 but it depends how you kit them out- standard is probably a must for the +1 combat res , but don't spend too many points on them otherwise you will find it hard to block out your army with anything else than marauders.
If you want some magic in there a level 2 sorcerer with a power familiar is pretty decent- with a mark or one of the lores.. overall you'd be getting 5 power dice all that can be used on that 1 sorcerer if he is your only magic user.
with the warriors i'd run the them in ranks of 6 x 2-3 -that way you are making the most of those 2 attacks each.
If you want some magic in there a level 2 sorcerer with a power familiar is pretty decent- with a mark or one of the lores.. overall you'd be getting 5 power dice all that can be used on that 1 sorcerer if he is your only magic user.
with the warriors i'd run the them in ranks of 6 x 2-3 -that way you are making the most of those 2 attacks each.
